diff --git a/ext/bcmath/bcmath.c b/ext/bcmath/bcmath.c
index b7afaf04d32..1b91fba72fe 100644
--- a/ext/bcmath/bcmath.c
+++ b/ext/bcmath/bcmath.c
@@ -20,7 +20,7 @@
 
 #include "php.h"
 
-#if HAVE_BCMATH
+#ifdef HAVE_BCMATH
 
 #include "php_ini.h"
 #include "zend_exceptions.h"