--- a/Common/Hashmaps.h
+++ b/Common/Hashmaps.h
@@ -2,6 +2,7 @@
 
 #include <cstring>
 #include <vector>
+#include <stdint.h> /* uint32_t */
 
 #include "ext/xxhash.h"
 #include "Common/CommonFuncs.h"
