diff --git a/src/compiler/builder.ts b/src/compiler/builder.ts
index 49a5bfc8d97..635855083c0 100644
--- a/src/compiler/builder.ts
+++ b/src/compiler/builder.ts
@@ -238,7 +238,7 @@ namespace ts {
             const cachedDiagnostics = semanticDiagnosticsPerFile.get(path);
             // Report the semantic diagnostics from the cache if we already have those diagnostics present
             if (cachedDiagnostics) {
-                cachedDiagnostics;
+                return cachedDiagnostics;
             }
 
             // Diagnostics werent cached, get them from program, and cache the result