1 files changed, 1 insertions, 1 deletions
diff --git a/complex.c b/complex.c
index ec52beaf0a..fc2cd0e783 100644
--- a/complex.c
+++ b/complex.c
@@ -14,7 +14,7 @@
 #include "internal.h"
 
 #define NDEBUG
-#include <assert.h>
+#include "ruby_assert.h"
 
 #define ZERO INT2FIX(0)
 #define ONE INT2FIX(1)