diff --git a/clang/tools/clang-scan-deps/ClangScanDeps.cpp b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
index 0e2758d123edc..e41f4eb7999ae 100644
--- a/clang/tools/clang-scan-deps/ClangScanDeps.cpp
+++ b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
@@ -420,7 +420,7 @@ class FullDeps {
     std::vector<ModuleDeps *> NewMDs;
     {
       std::unique_lock<std::mutex> ul(Lock);
-      for (const ModuleDeps &MD : Graph) {
+      for (ModuleDeps &MD : Graph) {
         auto I = Modules.find({MD.ID, 0});
         if (I != Modules.end()) {
           I->first.InputIndex = std::min(I->first.InputIndex, InputIndex);