diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0809d21def..3ac8480cec 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1016,7 +1016,6 @@ system:mutexatomics:sid:amd64:
   dependencies:
     - mutexatomics:sid:amd64
   needs: ["mutexatomics:sid:amd64"]
-  allow_failure: true
 
 unit:mutexatomics:sid:amd64:
   <<: *debian_sid_amd64_image
@@ -1024,7 +1023,6 @@ unit:mutexatomics:sid:amd64:
   dependencies:
     - mutexatomics:sid:amd64
   needs: ["mutexatomics:sid:amd64"]
-  allow_failure: true
 
 # Jobs for Clang builds on Debian Stretch (amd64)
 
diff --git a/lib/isc/tests/socket_test.c b/lib/isc/tests/socket_test.c
index 57bf8e47fb..24af5b8e55 100644
--- a/lib/isc/tests/socket_test.c
+++ b/lib/isc/tests/socket_test.c
@@ -70,7 +70,7 @@ typedef struct {
 
 static void
 completion_init(completion_t *completion) {
-	atomic_store(&completion->done, false);
+	atomic_init(&completion->done, false);
 	completion->socket = NULL;
 }