diff --git a/economy.c b/economy.c
index c42fdfaa2a..66aaff6f24 100644
--- a/economy.c
+++ b/economy.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h" // XXX InjectDParam()
 #include "table/strings.h"
 #include "map.h"
 #include "news.h"
@@ -1191,7 +1192,7 @@ static bool CheckSubsidised(Station *from, Station *to, byte cargo_type)
 
 			/* Add a news item */
 			pair = SetupSubsidyDecodeParam(s, 0);
-			INJECT_DPARAM(2);
+			InjectDParam(2);
 
 			p = DEREF_PLAYER(_current_player);
 			SetDParam(0, p->name_1);
diff --git a/functions.h b/functions.h
index 9808f7ccb9..2659b4bf43 100644
--- a/functions.h
+++ b/functions.h
@@ -47,15 +47,6 @@ static inline Point RemapCoords2(int x, int y)
 	return RemapCoords(x, y, GetSlopeZ(x, y));
 }
 
-/* game.c */
-byte *GetString(byte *buffr, uint16 string);
-void InjectDparam(int amount);
-
-int32 GetParamInt32(void);
-int GetParamInt16(void);
-int GetParamInt8(void);
-int GetParamUint16(void);
-
 
 /* clear_land.c */
 void DrawHillyLandTile(TileInfo *ti);
diff --git a/gfx.c b/gfx.c
index bc9c6eea19..5c6e1751e7 100644
--- a/gfx.c
+++ b/gfx.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "gfx.h"
 #include "table/palettes.h"
 #include "hal.h"
diff --git a/industry_gui.c b/industry_gui.c
index b503f1f573..579100a263 100644
--- a/industry_gui.c
+++ b/industry_gui.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "map.h"
 //#include "gui.h"
diff --git a/main_gui.c b/main_gui.c
index 3a754e69b3..680e04f415 100644
--- a/main_gui.c
+++ b/main_gui.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "map.h"
 #include "tile.h"
@@ -45,8 +46,6 @@ extern void GenerateWorld(int mode, uint log_x, uint log_y);
 extern void GenerateIndustries(void);
 extern void GenerateTowns(void);
 
-extern uint GetCurrentCurrencyRate(void);
-
 extern void CcTerraform(bool success, uint tile, uint32 p1, uint32 p2);
 
 void HandleOnEditTextCancel(void)
diff --git a/misc.c b/misc.c
index c4e0a8df19..546aeeaa87 100644
--- a/misc.c
+++ b/misc.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h" // XXX GetParam*
 #include "table/strings.h"
 #include "map.h"
 #include "vehicle.h"
diff --git a/misc_gui.c b/misc_gui.c
index 6dcb30c653..882e21d5ca 100644
--- a/misc_gui.c
+++ b/misc_gui.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "map.h"
 #include "window.h"
diff --git a/network.c b/network.c
index 5b6a46427c..2a72de7719 100644
--- a/network.c
+++ b/network.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "debug.h"
+#include "strings.h"
 #include "map.h"
 #include "network_data.h"
 
@@ -44,7 +45,6 @@ static uint16 _network_client_index = NETWORK_SERVER_INDEX + 1;
 /* Some externs / forwards */
 extern void ShowJoinStatusWindow(void);
 extern void StateGameLoop(void);
-extern uint GetCurrentCurrencyRate(void);
 
 // Function that looks up the CI for a given client-index
 NetworkClientInfo *NetworkFindClientInfoFromIndex(uint16 client_index)
diff --git a/network_client.c b/network_client.c
index 8deec2fd3c..6a42b75d07 100644
--- a/network_client.c
+++ b/network_client.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "debug.h"
+#include "strings.h"
 #include "network_data.h"
 
 #ifdef ENABLE_NETWORK
diff --git a/network_gui.c b/network_gui.c
index f5aea33e34..95b4707e04 100644
--- a/network_gui.c
+++ b/network_gui.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "network.h"
 #include "saveload.h"
 
diff --git a/network_server.c b/network_server.c
index 0fee527797..594f7856aa 100644
--- a/network_server.c
+++ b/network_server.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "debug.h"
+#include "strings.h"
 #include "network_data.h"
 
 #ifdef ENABLE_NETWORK
diff --git a/news_gui.c b/news_gui.c
index a17946c906..b8931a36c3 100644
--- a/news_gui.c
+++ b/news_gui.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "window.h"
 #include "gui.h"
diff --git a/players.c b/players.c
index a33307cc26..a48b4ac7cf 100644
--- a/players.c
+++ b/players.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "map.h"
 #include "player.h"
diff --git a/screenshot.c b/screenshot.c
index d0e0107d33..b7129a4a9c 100644
--- a/screenshot.c
+++ b/screenshot.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "gfx.h"
 #include "viewport.h"
diff --git a/settings_gui.c b/settings_gui.c
index af394b3ae0..e1e0512a66 100644
--- a/settings_gui.c
+++ b/settings_gui.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h" // XXX GetCurrentCurrencyRate()
 #include "table/strings.h"
 #include "window.h"
 #include "gui.h"
@@ -726,7 +727,6 @@ static const PatchPage _patches_page[] = {
 	{_patches_ai,						lengthof(_patches_ai) },
 };
 
-extern uint GetCurrentCurrencyRate(void);
 
 static int32 ReadPE(const PatchEntry*pe)
 {
diff --git a/station_gui.c b/station_gui.c
index 8453c555f0..d628211df2 100644
--- a/station_gui.c
+++ b/station_gui.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "window.h"
 #include "gui.h"
diff --git a/strings.c b/strings.c
index 4925bbf5b5..a089aa4a3d 100644
--- a/strings.c
+++ b/strings.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "namegen.h"
 #include "station.h"
@@ -109,7 +110,7 @@ byte *GetString(byte *buffr, uint16 string)
 	return DecodeString(buffr, GetStringPtr(string));
 }
 
-void InjectDparam(int amount)
+void InjectDParam(int amount)
 {
 	memmove(_decode_parameters + amount, _decode_parameters, sizeof(_decode_parameters) - amount * sizeof(uint32));
 }
@@ -443,7 +444,7 @@ static byte *DecodeString(byte *buff, const byte *str)
 
 		case 0x9A: { // {STATION}
 			Station *st;
-			InjectDparam(1);
+			InjectDParam(1);
 			st = GetStation(GetDParam(1));
 			if (!st->xy) { // station doesn't exist anymore
 				buff = GetString(buff, STR_UNKNOWN_DESTINATION);
@@ -480,7 +481,7 @@ static byte *DecodeString(byte *buff, const byte *str)
 				if (idx == 0) {
 					str = STR_WAYPOINTNAME_CITY;
 				} else {
-					InjectDparam(1);
+					InjectDParam(1);
 					SetDParam(1, idx + 1);
 					str = STR_WAYPOINTNAME_CITY_SERIAL;
 				}
diff --git a/strings.h b/strings.h
new file mode 100644
index 0000000000..bff978c929
--- /dev/null
+++ b/strings.h
@@ -0,0 +1,15 @@
+#ifndef STRINGS_H
+#define STRINGS_H
+
+byte *GetString(byte *buffr, uint16 string);
+
+void InjectDParam(int amount);
+
+int32 GetParamInt32(void);
+int GetParamInt16(void);
+int GetParamInt8(void);
+int GetParamUint16(void);
+
+uint GetCurrentCurrencyRate(void);
+
+#endif
diff --git a/texteff.c b/texteff.c
index 3e5f6fc896..73789bd069 100644
--- a/texteff.c
+++ b/texteff.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "gfx.h"
 #include "viewport.h"
 #include "saveload.h"
diff --git a/town_cmd.c b/town_cmd.c
index ad7dd4847d..7c9737a05c 100644
--- a/town_cmd.c
+++ b/town_cmd.c
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ttd.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "map.h"
 #include "tile.h"
diff --git a/town_gui.c b/town_gui.c
index 84b5a319c6..a5441bbb47 100644
--- a/town_gui.c
+++ b/town_gui.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "town.h"
 #include "window.h"
diff --git a/ttd.c b/ttd.c
index 7dbf115e4e..46e9b2d100 100644
--- a/ttd.c
+++ b/ttd.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "table/strings.h"
 #include "debug.h"
+#include "strings.h"
 #include "map.h"
 #include "tile.h"
 
diff --git a/variables.h b/variables.h
index 895ca3aaa4..9ac5800efa 100644
--- a/variables.h
+++ b/variables.h
@@ -412,7 +412,6 @@ static inline uint32 GetDParam(uint n)
 #define COPY_IN_DPARAM(offs,src,num) memcpy(_decode_parameters + offs, src, sizeof(uint32) * (num))
 #define COPY_OUT_DPARAM(dst,offs,num) memcpy(dst,_decode_parameters + offs, sizeof(uint32) * (num))
 
-#define INJECT_DPARAM(n) InjectDparam(n);
 
 #define SET_EXPENSES_TYPE(x) _yearly_expenses_type = x;
 
diff --git a/vehicle_gui.c b/vehicle_gui.c
index 9344fc2b93..2a932380d0 100644
--- a/vehicle_gui.c
+++ b/vehicle_gui.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "vehicle.h"
 #include "window.h"
diff --git a/viewport.c b/viewport.c
index 737a5c3505..4718a8c466 100644
--- a/viewport.c
+++ b/viewport.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "ttd.h"
 #include "debug.h"
+#include "strings.h"
 #include "table/strings.h"
 #include "map.h"
 #include "viewport.h"