diff --git a/llvm/unittests/Transforms/InstCombine/X86/TernlogTest.cpp b/llvm/unittests/Transforms/InstCombine/X86/TernlogTest.cpp
index 669d73289bc3a..df9d1cc9b2980 100644
--- a/llvm/unittests/Transforms/InstCombine/X86/TernlogTest.cpp
+++ b/llvm/unittests/Transforms/InstCombine/X86/TernlogTest.cpp
@@ -125,7 +125,7 @@ struct TernTester {
       if (C->isOneValue())
         return 1;
 
-      assert(0 && "Unknown constant type");
+      llvm_unreachable("Unknown constant type");
     };
 
     auto ComputeBit = [&](uint64_t A, uint64_t B, uint64_t C) -> uint64_t {