diff --git a/.gitignore b/.gitignore
index 29b56aec..b4ba2675 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,10 @@ flamenco-worker-credentials.yaml
 node_modules/
 /vendor/
 
+# Mockgen creates those files temporarily, and they can linger when it
+# fails to run properly. They should never be committed to Git.
+gomock_reflect_*
+
 # Directory for custom job compiler scripts:
 /scripts/