diff --git a/src/bin/pg_rewind/t/003_extrafiles.pl b/src/bin/pg_rewind/t/003_extrafiles.pl
index 155239c59a7..ae110a9afd1 100644
--- a/src/bin/pg_rewind/t/003_extrafiles.pl
+++ b/src/bin/pg_rewind/t/003_extrafiles.pl
@@ -77,7 +77,7 @@ sub run_test
 		{
 			$filename =~ s{\\}{/}g;
 		}
-		$test_primary_datadir =~ s{\\}{/}g;
+		$test_master_datadir =~ s{\\}{/}g;
 	}
 
 	is_deeply(