diff --git a/Source/Contents/NavigationGraph.cpp b/Source/Contents/NavigationGraph.cpp
index 10a91380..2e830ddb 100644
--- a/Source/Contents/NavigationGraph.cpp
+++ b/Source/Contents/NavigationGraph.cpp
@@ -180,9 +180,9 @@ done:
 // OFFSET: 0x00B8A720
 // FUNCTION: fn_19394
 void CNaviData::ResetLinkDepths() {
-  for (CNaviInfo* destination : this->destinations) {
-    std::vector<CNavi_Link*>::iterator end = destination->LinksEnd();
-    for (std::vector<CNavi_Link*>::iterator it = destination->LinksBegin(); it != end; ++it) {
+  for (CNaviInfo*& destination : this->destinations) {
+    std::vector<CNavi_Link*>::const_iterator end = destination->LinksEnd();
+    for (std::vector<CNavi_Link*>::const_iterator it = destination->LinksBegin(); it != end; ++it) {
       (*it)->SetDepth(-1);
     }
   }