diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -148,6 +148,7 @@
 
 static cl::opt<unsigned>
 MaxBruteForceIterations("scalar-evolution-max-iterations", cl::ReallyHidden,
+                        cl::ZeroOrMore,
                         cl::desc("Maximum number of iterations SCEV will "
                                  "symbolically execute a constant "
                                  "derived loop"),