diff --git a/lib/LTO/ThinLTOCodeGenerator.cpp b/lib/LTO/ThinLTOCodeGenerator.cpp
index fea1c7fb8fa..c9e91eb2202 100644
--- a/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -173,6 +173,10 @@ static void ResolveODR(GlobalValue &GV, const ModuleSummaryIndex &Index,
 /// one copy.
 static void ResolveODR(Module &TheModule,
                              const ModuleSummaryIndex &Index) {
+  if (Index.modulePaths().size() == 1)
+    // Nothing to do if we don't have multiple modules
+    return;
+
   // We won't optimize the globals that are referenced by an alias for now
   // Ideally we should turn the alias into a global and duplicate the definition
   // when needed.