diff --git a/src/qiree/ResultDistribution.hh b/src/qiree/ResultDistribution.hh
index 58edb3c..fb3af9e 100644
--- a/src/qiree/ResultDistribution.hh
+++ b/src/qiree/ResultDistribution.hh
@@ -7,6 +7,7 @@
 //---------------------------------------------------------------------------//
 #pragma once
 
+#include <cstdint>
 #include <string>
 #include <unordered_map>