diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 10c60ed..1e723d7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -24,3 +24,7 @@ focal-nightly:
 elbrus-nightly:
   extends: .scheduled-elbrus
 
+check-format-sources:
+  only:
+    - merge_requests
+  extends: .check-format-sources
diff --git a/scheduled.yml b/scheduled.yml
index 0f279da..22e1a18 100644
--- a/scheduled.yml
+++ b/scheduled.yml
@@ -93,3 +93,17 @@ variables:
   extends: .scheduled-test
   tags: ['elbrus']
 
+.check-format-sources:
+  image: focal-dev
+  tags: ['docker']
+  script:
+    - >
+      if [ -n "${CHECK_FORMAT_SOURCES_CMD}" ]; then
+        ${CHECK_FORMAT_SOURCES_CMD}
+      else
+        mkdir build
+        cd build
+        cmake -G Ninja ..
+        ninja check-format-sources
+      fi
+