diff --git a/stm-firmware/syscalls.c b/stm-firmware/syscalls.c
index 052ffaa..a016d6f 100644
--- a/stm-firmware/syscalls.c
+++ b/stm-firmware/syscalls.c
@@ -99,6 +99,8 @@ int _getpid()
 
 int _kill(int pid)
 {
+	(void)pid;
+
 	return -1;
 }