diff --git a/unsupported/test/mpreal/mpreal.h b/unsupported/test/mpreal/mpreal.h
index 7d14c0961..c4f6cf0cb 100644
--- a/unsupported/test/mpreal/mpreal.h
+++ b/unsupported/test/mpreal/mpreal.h
@@ -56,7 +56,6 @@
 #include <cmath>
 #include <cstring>
 #include <limits>
-#include <cstdint>
 #include <complex>
 #include <algorithm>