diff --git a/codon/sir/llvm/llvisitor.cpp b/codon/sir/llvm/llvisitor.cpp
index 37ac5380..cd0cf2ee 100644
--- a/codon/sir/llvm/llvisitor.cpp
+++ b/codon/sir/llvm/llvisitor.cpp
@@ -700,9 +700,13 @@ llvm::DISubprogram *LLVMVisitor::getDISubprogramForFunc(const Func *x) {
   auto *derivedType = llvm::cast<llvm::DIDerivedType>(getDIType(x->getType()));
   auto *subroutineType =
       llvm::cast<llvm::DISubroutineType>(derivedType->getRawBaseType());
+
+  std::string baseName = x->getUnmangledName();
+  if (auto *parent = x->getParentType())
+    baseName = parent->getName() + "." + baseName;
   llvm::DISubprogram *subprogram = db.builder->createFunction(
-      file, x->getUnmangledName(), getNameForFunction(x), file, srcInfo->line,
-      subroutineType, /*ScopeLine=*/0, llvm::DINode::FlagZero,
+      file, baseName, getNameForFunction(x), file, srcInfo->line, subroutineType,
+      /*ScopeLine=*/0, llvm::DINode::FlagZero,
       llvm::DISubprogram::toSPFlags(/*IsLocalToUnit=*/true,
                                     /*IsDefinition=*/true, /*IsOptimized=*/!db.debug));
   return subprogram;