diff --git a/src/r_defs.h b/src/r_defs.h
index afd16967c..5bdcaff1a 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -727,8 +727,8 @@ typedef struct
 
 typedef struct
 {
-	size_t topdelta;
-	size_t length;
+	unsigned topdelta;
+	unsigned length;
 	size_t data_offset;
 } post_t;