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-rw-r--r--src/newgrf.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf.h b/src/newgrf.h
index dc9e1e67d..e05ef89fe 100644
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -129,7 +129,7 @@ void LoadNewGRFFile(GRFConfig *config, uint file_index, GrfLoadingStage stage);
void LoadNewGRF(uint load_index, uint file_index);
void ReloadNewGRFData(); // in saveload/afterload.cpp
-void CDECL grfmsg(int severity, const char *str, ...);
+void CDECL grfmsg(int severity, const char *str, ...) WARN_FORMAT(2, 3);
bool HasGrfMiscBit(GrfMiscBit bit);
bool GetGlobalVariable(byte param, uint32 *value);