diff --git a/src/platforms/posix/px4_layer/drv_hrt.c b/src/platforms/posix/px4_layer/drv_hrt.c
index 9874278012..5aab5803c3 100644
--- a/src/platforms/posix/px4_layer/drv_hrt.c
+++ b/src/platforms/posix/px4_layer/drv_hrt.c
@@ -48,7 +48,7 @@
 #include <errno.h>
 #include "hrt_work.h"
 
-static struct sq_queue_s	callout_queue;
+static struct sq_queue_s	callout_queue = {};
 
 /* latency histogram */
 #define LATENCY_BUCKET_COUNT 8