diff --git a/vlib/v/gen/c/cheaders.v b/vlib/v/gen/c/cheaders.v
index cd4fa7928a..5a3d71bfdd 100644
--- a/vlib/v/gen/c/cheaders.v
+++ b/vlib/v/gen/c/cheaders.v
@@ -332,7 +332,7 @@ voidptr memdup(voidptr src, int sz);
 	#error Cygwin is not supported, please use MinGW or Visual Studio.
 #endif
 
-#ifdef defined(__linux__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__vinix__) || defined(__serenity__) || defined(__sun)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__vinix__) || defined(__serenity__) || defined(__sun)
 	#include <sys/types.h>
 	#include <sys/wait.h> // os__wait uses wait on nix
 #endif