diff --git a/src/openrct2/entity/Staff.cpp b/src/openrct2/entity/Staff.cpp
index 195056413c..da4dd878df 100644
--- a/src/openrct2/entity/Staff.cpp
+++ b/src/openrct2/entity/Staff.cpp
@@ -299,6 +299,17 @@ void Staff::SetPatrolArea(const CoordsXY& coords, bool value)
     PatrolInfo->Set(coords, value);
 }
 
+void Staff::SetPatrolArea(const MapRange& range, bool value)
+{
+    for (int32_t yy = range.GetTop(); yy <= range.GetBottom(); yy += COORDS_XY_STEP)
+    {
+        for (int32_t xx = range.GetLeft(); xx <= range.GetRight(); xx += COORDS_XY_STEP)
+        {
+            SetPatrolArea({ xx, yy }, value);
+        }
+    }
+}
+
 void Staff::ClearPatrolArea()
 {
     delete PatrolInfo;
diff --git a/src/openrct2/entity/Staff.h b/src/openrct2/entity/Staff.h
index 472665dc0b..d373e99be7 100644
--- a/src/openrct2/entity/Staff.h
+++ b/src/openrct2/entity/Staff.h
@@ -63,6 +63,7 @@ public:
 
     void ClearPatrolArea();
     void SetPatrolArea(const CoordsXY& coords, bool value);
+    void SetPatrolArea(const MapRange& range, bool value);
     bool HasPatrolArea() const;
     std::vector<TileCoordsXY> GetPatrolArea();
     void SetPatrolArea(const std::vector<TileCoordsXY>& area);
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index 7530c8f64e..4bd196d03f 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -1361,13 +1361,8 @@ namespace RCT1
                     x <<= 7;
                     int32_t y = val & 0x3E0;
                     y <<= 2;
-                    for (int32_t offsetY = 0; offsetY < 4 * COORDS_XY_STEP; offsetY += COORDS_XY_STEP)
-                    {
-                        for (int32_t offsetX = 0; offsetX < 4 * COORDS_XY_STEP; offsetX += COORDS_XY_STEP)
-                        {
-                            staffmember->SetPatrolArea({ x + offsetX, y + offsetY }, true);
-                        }
-                    }
+                    staffmember->SetPatrolArea(
+                        MapRange(x, y, x + (4 * COORDS_XY_STEP) - 1, y + (4 * COORDS_XY_STEP) - 1), true);
                 }
             }
         }
diff --git a/src/openrct2/rct2/S6Importer.cpp b/src/openrct2/rct2/S6Importer.cpp
index a4d667e48c..2d1261b32b 100644
--- a/src/openrct2/rct2/S6Importer.cpp
+++ b/src/openrct2/rct2/S6Importer.cpp
@@ -1516,13 +1516,8 @@ namespace RCT2
                     x <<= 7;
                     int32_t y = val & 0xFC0;
                     y <<= 1;
-                    for (int32_t offsetY = 0; offsetY < 4 * COORDS_XY_STEP; offsetY += COORDS_XY_STEP)
-                    {
-                        for (int32_t offsetX = 0; offsetX < 4 * COORDS_XY_STEP; offsetX += COORDS_XY_STEP)
-                        {
-                            staffmember->SetPatrolArea({ x + offsetX, y + offsetY }, true);
-                        }
-                    }
+                    staffmember->SetPatrolArea(
+                        MapRange(x, y, x + (4 * COORDS_XY_STEP) - 1, y + (4 * COORDS_XY_STEP) - 1), true);
                 }
             }
         }