diff --git a/rmutil/periodic.c b/rmutil/periodic.c
index 01ae70c..dbddceb 100644
--- a/rmutil/periodic.c
+++ b/rmutil/periodic.c
@@ -1,3 +1,4 @@
+#define REDISMODULE_EXPERIMENTAL_API
 #include "periodic.h"
 #include <pthread.h>
 #include <stdlib.h>
diff --git a/rmutil/util.c b/rmutil/util.c
index 7fb3220..886c8b5 100644
--- a/rmutil/util.c
+++ b/rmutil/util.c
@@ -6,6 +6,7 @@
 #include <stdarg.h>
 #include <limits.h>
 #include <string.h>
+#define REDISMODULE_EXPERIMENTAL_API
 #include <redismodule.h>
 #include "util.h"