diff --git a/src/scanner.c b/src/scanner.c
index fa8e0c0a..ca03c57c 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -199,7 +199,7 @@ static const char *indent(int n)
 }
 
 static void
-desc_dump(char *desc, const char *fmt, ...) __attribute__((format(printf,2,3)));
+desc_dump(char *desc, const char *fmt, ...) WL_PRINTF(2, 3);
 
 static void
 desc_dump(char *desc, const char *fmt, ...)