diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
index 89bfc17d1b82c1..81e5aa223c0708 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
@@ -64,6 +64,10 @@ static cl::opt<LoopVectorizeHints::ScalableForceKind>
         cl::values(
             clEnumValN(LoopVectorizeHints::SK_FixedWidthOnly, "off",
                        "Scalable vectorization is disabled."),
+            clEnumValN(
+                LoopVectorizeHints::SK_PreferScalable, "preferred",
+                "Scalable vectorization is available and favored when the "
+                "cost is inconclusive."),
             clEnumValN(
                 LoopVectorizeHints::SK_PreferScalable, "on",
                 "Scalable vectorization is available and favored when the "