diff --git a/headers/modsecurity/collection/collection.h b/headers/modsecurity/collection/collection.h
index 352dfb7702..f1a194e3f5 100644
--- a/headers/modsecurity/collection/collection.h
+++ b/headers/modsecurity/collection/collection.h
@@ -26,6 +26,7 @@
 
 
 #include "modsecurity/variable_value.h"
+#include <stdint.h>
 
 
 #ifndef HEADERS_MODSECURITY_COLLECTION_COLLECTION_H_