diff --git a/absl/strings/internal/str_format/extension.h b/absl/strings/internal/str_format/extension.h
index c47536d63e2..08c3fbebba0 100644
--- a/absl/strings/internal/str_format/extension.h
+++ b/absl/strings/internal/str_format/extension.h
@@ -17,6 +17,7 @@
 #define ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
 
 #include <limits.h>
+#include <stdint.h>
 
 #include <cstddef>
 #include <cstring>