diff --git a/Regex/Execute.h b/Regex/Execute.h
index 4135a7f0..2c37cc45 100644
--- a/Regex/Execute.h
+++ b/Regex/Execute.h
@@ -8,6 +8,7 @@
 #include <bitset>
 #include <cstdint>
 #include <memory>
+#include <limits>
 
 // #define ENABLE_CROSS_REGEX_BACKREF