diff --git a/services/inputflinger/InputReader.cpp b/services/inputflinger/InputReader.cpp
index 935d0f6..d4266f6 100644
--- a/services/inputflinger/InputReader.cpp
+++ b/services/inputflinger/InputReader.cpp
@@ -257,7 +257,7 @@
         const String8* uniqueDisplayId, DisplayViewport* outViewport) const {
     const DisplayViewport* viewport = NULL;
     if (viewportType == ViewportType::VIEWPORT_VIRTUAL && uniqueDisplayId != NULL) {
-        for (DisplayViewport currentViewport : mVirtualDisplays) {
+        for (const DisplayViewport& currentViewport : mVirtualDisplays) {
             if (currentViewport.uniqueId == *uniqueDisplayId) {
                 viewport = &currentViewport;
                 break;