diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -70,8 +70,10 @@
 static cl::list<const PassInfo*, bool, PassNameParser>
 PassList(cl::desc("Optimizations available:"));
 
-static cl::opt<bool> EnableNewPassManager(
-    "enable-new-pm", cl::desc("Enable the new pass manager"), cl::init(false));
+static cl::opt<bool>
+    EnableNewPassManager("enable-new-pm",
+                         cl::desc("Enable the new pass manager"),
+                         cl::init(LLVM_ENABLE_NEW_PASS_MANAGER));
 
 // This flag specifies a textual description of the optimization pass pipeline
 // to run over the module. This flag switches opt to use the new pass manager