diff --git a/include/internal/catch_timer.h b/include/internal/catch_timer.h
index e01a1cb7..28e1f9db 100644
--- a/include/internal/catch_timer.h
+++ b/include/internal/catch_timer.h
@@ -8,7 +8,7 @@
 #ifndef TWOBLUECUBES_CATCH_TIMER_H_INCLUDED
 #define TWOBLUECUBES_CATCH_TIMER_H_INCLUDED
 
-#include <stdint.h>
+#include <cstdint>
 
 namespace Catch {