diff --git a/lib/AsmParser/llvmAsmParser.y b/lib/AsmParser/llvmAsmParser.y
index 263ef4c6ecc..a0c2e25bc5b 100644
--- a/lib/AsmParser/llvmAsmParser.y
+++ b/lib/AsmParser/llvmAsmParser.y
@@ -2823,7 +2823,7 @@ InstVal : ArithmeticOps Types ValueRef ',' ValueRef {
 
     // Check for call to invalid intrinsic to avoid crashing later.
     if (Function *theF = dyn_cast<Function>(V)) {
-      if (theF->hasName() && (strlen(theF->getValueName()->getKeyData()) >= 5)&&
+      if (theF->hasName() && (theF->getValueName()->getKeyLength() >= 5) &&
           (0 == strncmp(theF->getValueName()->getKeyData(), "llvm.", 5)) &&
           !theF->getIntrinsicID(true))
         GEN_ERROR("Call to invalid LLVM intrinsic function '" +