diff --git a/src/jtag/transport.c b/src/jtag/transport.c
index 5033ebc6d..f570103cc 100644
--- a/src/jtag/transport.c
+++ b/src/jtag/transport.c
@@ -125,8 +125,10 @@ int allow_transports(struct command_context *ctx, const char **vector)
 	} else {
 		/* guard against user config errors */
 		LOG_WARNING("must select a transport.");
-		while (*vector)
-			LOG_DEBUG("allow transport '%s'", *vector++);
+		while (*vector) {
+			LOG_DEBUG("allow transport '%s'", *vector);
+			vector++;
+		}
 		return ERROR_OK;
 	}
 }