diff --git a/llvm/lib/Support/ConstantRange.cpp b/llvm/lib/Support/ConstantRange.cpp
index 0432921..5206cf1 100644
--- a/llvm/lib/Support/ConstantRange.cpp
+++ b/llvm/lib/Support/ConstantRange.cpp
@@ -55,7 +55,7 @@
 
   uint32_t W = CR.getBitWidth();
   switch (Pred) {
-    default: assert(0 && "Invalid ICmp predicate to makeICmpRegion()");
+    default: llvm_unreachable("Invalid ICmp predicate to makeICmpRegion()");
     case CmpInst::ICMP_EQ:
       return CR;
     case CmpInst::ICMP_NE: