diff --git a/src/test/regress/.gitignore b/src/test/regress/.gitignore
index 7573add..72da567 100644
--- a/src/test/regress/.gitignore
+++ b/src/test/regress/.gitignore
@@ -5,3 +5,7 @@
 /tmp_check/
 /results/
 /log/
+
+# Error output
+/regression.diffs
+/regression.out