diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index a9c31ad7978..e4ec6e7e40e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -62,7 +62,7 @@ static cl::opt<bool> UnknownLocations(
 
 static cl::opt<bool> GenerateCUHash("generate-cu-hash", cl::Hidden,
                                     cl::desc("Add the CU hash as the dwo_id."),
-                                    cl::init(false));
+                                    cl::init(true));
 
 static cl::opt<bool>
 GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
diff --git a/test/DebugInfo/X86/fission-hash.ll b/test/DebugInfo/X86/fission-hash.ll
index ff6cf26db3b..3987faaf971 100644
--- a/test/DebugInfo/X86/fission-hash.ll
+++ b/test/DebugInfo/X86/fission-hash.ll
@@ -1,4 +1,4 @@
-; RUN: llc -split-dwarf=Enable -generate-cu-hash -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
+; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
 ; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s
 
 ; The source is an empty file.