diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index d724466a..6c5af40a 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -4571,7 +4571,8 @@ void CWriter::printIntrinsicDefinition(FunctionType *funT, unsigned Opcode,
   Out << " r;\n";
 
   if (isa<VectorType>(retT)) {
-    for (i = 0; i < numParams; i++) {
+    char vectorSize = dyn_cast<VectorType>(retT)->getNumElements();
+    for (i = 0; i < vectorSize; i++) {
       Out << "  r.vector[" << (int)i << "] = " << OpName << "_devec(";
       for (char j = 0; j < numParams; j++) {
         Out << (char)('a' + j);