diff --git a/libs/openFrameworks/utils/ofRandomDistributions.h b/libs/openFrameworks/utils/ofRandomDistributions.h
index fca79cb3ed3..263ecbbdf82 100644
--- a/libs/openFrameworks/utils/ofRandomDistributions.h
+++ b/libs/openFrameworks/utils/ofRandomDistributions.h
@@ -4,6 +4,7 @@
 #include "ofRandomEngine.h"
 #include "ofColor.h"
 #include <iostream>
+#include <optional>
 
 #ifdef TARGET_WIN32
 #include <iso646.h>