diff --git a/.conform.yaml b/.conform.yaml
index 133f87c5..6e1ac02c 100644
--- a/.conform.yaml
+++ b/.conform.yaml
@@ -26,7 +26,8 @@ script:
 
     set -e
 
-    if [[ ! -z "${TRAVIS_PULL_REQUEST}" ]]; then
+    # Only run if not a PR.
+    if [[ "${TRAVIS_PULL_REQUEST}" != "false" ]]; then
       exit 0
     fi