diff --git a/tools/catalyst-auto-x86-demeter.conf b/tools/catalyst-auto-x86-demeter.conf
index 6f16156f..84c2f985 100644
--- a/tools/catalyst-auto-x86-demeter.conf
+++ b/tools/catalyst-auto-x86-demeter.conf
@@ -7,6 +7,7 @@ host=$(hostname)
 
 ARCH="x86"
 TYPE="auto"
+EMAIL_SUBJECT_PREPEND="[x86-auto]"
 
 SPECS_DIR=${REPO_DIR}/releases/specs/x86