diff --git a/include/serve.php b/include/serve.php
index b900669..62adef1 100644
--- a/include/serve.php
+++ b/include/serve.php
@@ -52,7 +52,7 @@
 
 		// Invalidate by path.
 		if ( substr( $flag, 0, 1 ) == '/' ) {
-			if ( substr( $meta['path'], 0, strlen( $flag ) ) ) {
+			if ( substr( $meta['path'], 0, strlen( $flag ) ) === $flag ) {
 				header( 'X-Cache: expired' );
 				fclose( $f );
 				return;