diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 977472f539..591f35daaf 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -544,7 +544,7 @@ Signed-off-by: A U Thor
 EOF
 
 unfold () {
-	perl -0pe 's/\n\s+/ /'
+	perl -0pe 's/\n\s+/ /g'
 }
 
 test_expect_success 'set up trailer tests' '