diff --git a/src/SDL_error.c b/src/SDL_error.c
index 4341cd068..11632f281 100644
--- a/src/SDL_error.c
+++ b/src/SDL_error.c
@@ -136,7 +136,7 @@ char *SDL_GetErrorMsg(char *errstr, unsigned int maxlen)
 			if ( *fmt == '%' ) {
 				char tmp[32], *spot = tmp;
 				*spot++ = *fmt++;
-				while ( *fmt == '.' || (*fmt >= '0' && *fmt <= '9') && spot < (tmp+SDL_arraysize(tmp)-2) ) {
+				while ( (*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) && spot < (tmp+SDL_arraysize(tmp)-2) ) {
 					*spot++ = *fmt++;
 				}
 				*spot++ = *fmt++;