diff --git a/lib/IRGen/IRGenDebugInfo.cpp b/lib/IRGen/IRGenDebugInfo.cpp
index b6a90c5e2e225..92f56331d9c7f 100644
--- a/lib/IRGen/IRGenDebugInfo.cpp
+++ b/lib/IRGen/IRGenDebugInfo.cpp
@@ -2958,7 +2958,12 @@ IRGenDebugInfoImpl::emitFunction(const SILDebugScope *DS, llvm::Function *Fn,
   // Because there's no good way to cross the CU boundary to insert a nested
   // DISubprogram definition in one CU into a type defined in another CU when
   // doing LTO builds.
-  if (llvm::isa<llvm::DICompositeType>(Scope)) {
+  if (llvm::isa<llvm::DICompositeType>(Scope) &&
+      (Rep == SILFunctionTypeRepresentation::Method ||
+       Rep == SILFunctionTypeRepresentation::ObjCMethod ||
+       Rep == SILFunctionTypeRepresentation::WitnessMethod ||
+       Rep == SILFunctionTypeRepresentation::CXXMethod ||
+       Rep == SILFunctionTypeRepresentation::Thin)) {
     llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::toSPFlags(
         /*IsLocalToUnit=*/Fn ? Fn->hasInternalLinkage() : true,
         /*IsDefinition=*/false, /*IsOptimized=*/Opts.shouldOptimize());