diff --git a/tests/test-commit-sign.sh b/tests/test-commit-sign.sh
index 01a3a2ed..0db0048f 100755
--- a/tests/test-commit-sign.sh
+++ b/tests/test-commit-sign.sh
@@ -25,7 +25,7 @@ fi
 
 # Skip the test when non-root as gpgme would not read files owned by
 # another user.
-if test "$(id -i)" != "0"; then
+if test "$(id -u)" != "0"; then
     exit 77
 fi