diff --git a/boot/boot_serial/src/boot_serial.c b/boot/boot_serial/src/boot_serial.c
index 44a28fc..3fded86 100644
--- a/boot/boot_serial/src/boot_serial.c
+++ b/boot/boot_serial/src/boot_serial.c
@@ -583,7 +583,7 @@
 {
     int rc;
     int off;
-    int dec_off;
+    int dec_off = 0;
     int full_line;
     int max_input;