diff --git a/src/diagnostic.h b/src/diagnostic.h
index 178e769d05..3d95520adf 100644
--- a/src/diagnostic.h
+++ b/src/diagnostic.h
@@ -75,9 +75,17 @@ enum {
 
 extern int _log_levels[DIAGNOSTIC_LEVEL_COUNT];
 
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
 void diagnostic_log(int diagnosticLevel, const char *format, ...);
 void diagnostic_log_with_location(int diagnosticLevel, const char *file, const char *function, int line, const char *format, ...);
 
+#ifdef __cplusplus
+}
+#endif // __cplusplus
+
 #ifdef _MSC_VER
 
 #define diagnostic_log_macro(level, format, ...)	diagnostic_log_with_location(level, __FILE__, __FUNCTION__, __LINE__, format, __VA_ARGS__)