diff --git a/linux/Makefile b/linux/Makefile
index 2133dd7..5d1524a 100644
--- a/linux/Makefile
+++ b/linux/Makefile
@@ -1,5 +1,5 @@
 CROSS ?= /opt/riscv64-uclibc/bin/riscv64-buildroot-linux-uclibc-
-CFLAGS = -fPIC -Wl,-elf2flt=-r -Wall
+CFLAGS = -fPIC -Wl,-elf2flt=-r -Wall -Os
 BINARIES = term esptun
 
 all: $(BINARIES)
diff --git a/linux/esptun.c b/linux/esptun.c
index 7285b39..c02afa7 100644
--- a/linux/esptun.c
+++ b/linux/esptun.c
@@ -337,7 +337,7 @@ static bool esp_read_responses(int fd, bool early_terminate)
         size_t ptr = 0;
         while (ptr < esp_end) {
             const uint8_t *resp = &esp_buffer[ptr];
-            struct packet_info pkt_info;
+            struct packet_info pkt_info = {};
             size_t len = esp_response_is_complete(resp, esp_end - ptr, &pkt_info);
             if (len) {
                 logprintf(DEBUG, "<-: ");