diff --git a/src/vs/base/common/glob.ts b/src/vs/base/common/glob.ts
index 7200febd0391270772278f38489d58bf0383fe0d..78fc5e97ce1ec679275486920f56d3b92a254f5d 100644
--- a/src/vs/base/common/glob.ts
+++ b/src/vs/base/common/glob.ts
@@ -331,10 +331,10 @@ function wrapRelativePattern(parsedPattern: ParsedStringPattern, arg2: string |
 	}
 
 	return function (path, basename) {
-		if (extpath.isEqualOrParent(path, arg2.base)) {
-			return parsedPattern(paths.relative(arg2.base, path), basename);
+		if (!extpath.isEqualOrParent(path, arg2.base)) {
+			return null;
 		}
-		return null;
+		return parsedPattern(paths.relative(arg2.base, path), basename);
 	};
 }