diff --git a/lld/ELF/Symbols.cpp b/lld/ELF/Symbols.cpp
--- a/lld/ELF/Symbols.cpp
+++ b/lld/ELF/Symbols.cpp
@@ -385,7 +385,7 @@
         break;
       }
     if (!exclude)
-      warn("backward reference detected: " + sym.getName() + " in " +
+      warn("backward reference detected: " + toString(sym) + " in " +
            toString(it.second.first) + " refers to " + to);
   }
 }
diff --git a/lld/test/ELF/lto/warn-backrefs-demangle.ll b/lld/test/ELF/lto/warn-backrefs-demangle.ll
new file mode 100644
--- /dev/null
+++ b/lld/test/ELF/lto/warn-backrefs-demangle.ll
@@ -0,0 +1,30 @@
+; REQUIRES: x86
+;; Test that the referenced filename is correct (not <internal> or lto.tmp).
+
+; RUN: split-file %s %t
+; RUN: llvm-as %t/a.ll -o %ta.o
+; RUN: llvm-as %t/b.ll -o %tb.o
+; RUN: ld.lld --demangle --warn-backrefs --start-lib %tb.o --end-lib %ta.o -o /dev/null 2>&1 | FileCheck %s
+
+; CHECK: warning: backward reference detected: f() in {{.*}}a.o refers to {{.*}}b.o
+
+;--- a.ll
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare void @_Z1fv()
+
+define void @_start() {
+entry:
+  call void () @_Z1fv()
+  ret void
+}
+
+;--- b.ll
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @_Z1fv() {
+entry:
+  ret void
+}
diff --git a/lld/test/ELF/lto/warn-backrefs-no-demangle.ll b/lld/test/ELF/lto/warn-backrefs-no-demangle.ll
new file mode 100644
--- /dev/null
+++ b/lld/test/ELF/lto/warn-backrefs-no-demangle.ll
@@ -0,0 +1,30 @@
+; REQUIRES: x86
+;; Test that the referenced filename is correct (not <internal> or lto.tmp).
+
+; RUN: split-file %s %t
+; RUN: llvm-as %t/a.ll -o %ta.o
+; RUN: llvm-as %t/b.ll -o %tb.o
+; RUN: ld.lld --no-demangle --warn-backrefs --start-lib %tb.o --end-lib %ta.o -o /dev/null 2>&1 | FileCheck %s
+
+; CHECK: warning: backward reference detected: _Z1fv in {{.*}}a.o refers to {{.*}}b.o
+
+;--- a.ll
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare void @_Z1fv()
+
+define void @_start() {
+entry:
+  call void () @_Z1fv()
+  ret void
+}
+
+;--- b.ll
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @_Z1fv() {
+entry:
+  ret void
+}