diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 1dec6fc10928ae901873038ad1d9807183da826f..6508d6f04bb26486ef7f4ffab84a730cb16bd59c 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -10385,7 +10385,7 @@ Sema::CheckForFunctionRedefinition(FunctionDecl *FD,
   // through a deduced return type, or instantiate templates with local types.
   if (!hasVisibleDefinition(Definition) &&
       (Definition->getFormalLinkage() == InternalLinkage ||
-       Definition->isInlineSpecified() ||
+       Definition->isInlined() ||
        Definition->getDescribedFunctionTemplate() ||
        Definition->getNumTemplateParameterLists()))
     return;
diff --git a/test/Modules/Inputs/submodules-merge-defs/defs.h b/test/Modules/Inputs/submodules-merge-defs/defs.h
index 247b05c47082c757e9fe0d3cbaf6ca5bdcf51510..8b6fec60fcf74087ffcd29daf510fe0b7b6a6f2f 100644
--- a/test/Modules/Inputs/submodules-merge-defs/defs.h
+++ b/test/Modules/Inputs/submodules-merge-defs/defs.h
@@ -74,3 +74,9 @@ namespace FriendDefArg {
     template<typename, int, template<typename> class> friend struct D;
   };
 }
+
+namespace SeparateInline {
+  inline void f();
+  void f() {}
+  constexpr int g() { return 0; }
+}