1 files changed, 1 insertions, 1 deletions
diff --git a/pb.h b/pb.h
index bf6b35e7..b9c3f759 100644
--- a/pb.h
+++ b/pb.h
@@ -224,7 +224,7 @@ typedef enum {
 #define pb_membersize(st, m) (sizeof ((st*)0)->m)
 #define pb_arraysize(st, m) (pb_membersize(st, m) / pb_membersize(st, m[0]))
 #define pb_delta(st, m1, m2) ((int)offsetof(st, m1) - (int)offsetof(st, m2))
-#define pb_delta_end(st, m1, m2) (offsetof(st, m1) == offsetof(st, m2) \
+#define pb_delta_end(st, m1, m2) (int)(offsetof(st, m1) == offsetof(st, m2) \
                                   ? offsetof(st, m1) \
                                   : offsetof(st, m1) - offsetof(st, m2) - pb_membersize(st, m2))
 #define PB_LAST_FIELD {0,(pb_type_t) 0,0,0,0,0,0}