diff --git a/base/include/android-base/mapped_file.h b/base/include/android-base/mapped_file.h
index 52d11ed..667ba7e 100644
--- a/base/include/android-base/mapped_file.h
+++ b/base/include/android-base/mapped_file.h
@@ -16,6 +16,11 @@
 
 #pragma once
 
+#if __APPLE__
+/* Temporary Mac build fix for off64_t. TODO: refactor into `portability.h`. */
+#include "android-base/file.h"
+#endif
+
 #include "android-base/macros.h"
 
 #include <sys/types.h>