diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 51cfb7b040f..ffed136fb09 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -1002,7 +1002,7 @@ namespace ts {
         directories: string[];
     }
 
-    interface FileMatcherPatterns {
+    export interface FileMatcherPatterns {
         includeFilePattern: string;
         includeDirectoryPattern: string;
         excludePattern: string;