diff --git a/lib/Analysis/BlockFrequencyInfoImpl.cpp b/lib/Analysis/BlockFrequencyInfoImpl.cpp
index 037f0091f08..e4e45b3076b 100644
--- a/lib/Analysis/BlockFrequencyInfoImpl.cpp
+++ b/lib/Analysis/BlockFrequencyInfoImpl.cpp
@@ -48,7 +48,7 @@ cl::opt<bool> CheckBFIUnknownBlockQueries(
              "for debugging missed BFI updates"));
 
 cl::opt<bool> UseIterativeBFIInference(
-    "use-iterative-bfi-inference", cl::init(false), cl::Hidden,
+    "use-iterative-bfi-inference", cl::init(false), cl::Hidden, cl::ZeroOrMore,
     cl::desc("Apply an iterative post-processing to infer correct BFI counts"));
 
 cl::opt<unsigned> IterativeBFIMaxIterationsPerBlock(