diff --git a/examples/platforms/posix/misc.c b/examples/platforms/posix/misc.c
index 38d41ee9e..ec0b6d7e7 100644
--- a/examples/platforms/posix/misc.c
+++ b/examples/platforms/posix/misc.c
@@ -55,6 +55,8 @@ void otPlatReset(otInstance *aInstance)
     platformRadioDeinit();
     platformUartRestore();
 
+    alarm(0);
+
     execvp(argv[0], argv);
     perror("reset failed");
     exit(EXIT_FAILURE);