diff --git a/firmware/funk/mesh.c b/firmware/funk/mesh.c
index 412ab61..4a4ed60 100644
--- a/firmware/funk/mesh.c
+++ b/firmware/funk/mesh.c
@@ -218,7 +218,7 @@ static inline uint32_t popcount(uint32_t *buf, uint8_t n){
 
 uint8_t mesh_recvqloop_work(void){
     __attribute__ ((aligned (4))) uint8_t buf[32];
-    unsigned int len;
+    signed int len;
 
         len=nrf_rcv_pkt_poll_dec(sizeof(buf),buf,NULL);