diff --git a/firmware/basic/byteorder.c b/firmware/basic/byteorder.c
index 4239e60..5b644bc 100644
--- a/firmware/basic/byteorder.c
+++ b/firmware/basic/byteorder.c
@@ -10,7 +10,7 @@ void uint32touint8p(uint32_t v, uint8_t *p)
 
 uint32_t uint8ptouint32(uint8_t *p)
 {
-    uint32_t v;
+    uint32_t v=0;
     v |= *p++; v<<=8;
     v |= *p++; v<<=8;
     v |= *p++; v<<=8;
diff --git a/firmware/basic/xxtea.c b/firmware/basic/xxtea.c
index c59e3f4..bf23d13 100644
--- a/firmware/basic/xxtea.c
+++ b/firmware/basic/xxtea.c
@@ -13,7 +13,7 @@
 
 uint32_t htonl(uint32_t v)
 {
-    uint32_t r;
+    uint32_t r=0;
     r |= (v>> 0)&0xFF; r<<=8;
     r |= (v>> 8)&0xFF; r<<=8;
     r |= (v>>16)&0xFF; r<<=8;