diff --git a/include/cglm/io.h b/include/cglm/io.h
index f625791..41eeae9 100644
--- a/include/cglm/io.h
+++ b/include/cglm/io.h
@@ -39,6 +39,7 @@
    || defined(CGLM_NO_PRINTS_NOOP)
 
 #include "common.h"
+#include "util.h"
 
 #include <stdio.h>
 #include <stdlib.h>