diff --git a/src/frame.c b/src/frame.c
index ad6c217..3a4aa15 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -296,7 +296,7 @@ ssize_t patty_ax25_frame_encode(patty_ax25_frame *frame,
                                 void *info,
                                 size_t infolen,
                                 size_t len) {
-    size_t offset = 0;
+    size_t offset;
 
     offset = encode_address(buf,
                             &frame->dest,