diff --git a/source/jeger.c b/source/jeger.c
index c244fe2..5074182 100644
--- a/source/jeger.c
+++ b/source/jeger.c
@@ -1,4 +1,4 @@
-#if __cplusplus
+#ifdef __cplusplus
 # pragma GCC diagnostic ignored "-Wc++20-extensions"
 #endif