diff --git a/src/newgrf_industries.cpp b/src/newgrf_industries.cpp
--- a/src/newgrf_industries.cpp
+++ b/src/newgrf_industries.cpp
@@ -537,7 +537,7 @@ void IndustryProductionCallback(Industry
 			/* display error message */
 			SetDParamStr(0, spec->grf_prop.grffile->filename);
 			SetDParam(1, spec->name);
-			ShowErrorMessage(STR_NEWGRF_BUGGY, STR_NEWGRF_BUGGY_ENDLESS_PRODUCTION_CALLBACK, 0, 0);
+			ShowErrorMessage(STR_NEWGRF_BUGGY, STR_NEWGRF_BUGGY_ENDLESS_PRODUCTION_CALLBACK, WL_WARNING);
 
 			/* abort the function early, this error isn't critical and will allow the game to continue to run */
 			break;