diff --git a/libs/libc/include/sys/types.h b/libs/libc/include/sys/types.h
index 064996f5..5c96ba2a 100644
--- a/libs/libc/include/sys/types.h
+++ b/libs/libc/include/sys/types.h
@@ -10,4 +10,7 @@ typedef unsigned long int size_t;
 /* Signed version of size_t. */
 typedef long int ssize_t;
 
+/* The type of an offset into a file. */
+typedef long int off_t;
+
 #endif
\ No newline at end of file