diff --git a/mlir/lib/Dialect/Vector/IR/VectorOps.cpp b/mlir/lib/Dialect/Vector/IR/VectorOps.cpp
--- a/mlir/lib/Dialect/Vector/IR/VectorOps.cpp
+++ b/mlir/lib/Dialect/Vector/IR/VectorOps.cpp
@@ -2657,10 +2657,18 @@
   if (!vLHS)
     return parser.emitError(parser.getNameLoc(),
                             "expected vector type for operand #1");
-  VectorType resType =
-      vRHS ? VectorType::get({vLHS.getDimSize(0), vRHS.getDimSize(0)},
-                             vLHS.getElementType())
-           : VectorType::get({vLHS.getDimSize(0)}, vLHS.getElementType());
+
+  unsigned numScalableDims = vLHS.getNumScalableDims();
+  VectorType resType;
+  if (vRHS) {
+    numScalableDims += vRHS.getNumScalableDims();
+    resType = VectorType::get({vLHS.getDimSize(0), vRHS.getDimSize(0)},
+                              vLHS.getElementType(), numScalableDims);
+  } else {
+    // Scalar RHS operand
+    resType = VectorType::get({vLHS.getDimSize(0)}, vLHS.getElementType(),
+                              numScalableDims);
+  }
 
   if (!result.attributes.get(OuterProductOp::getKindAttrStrName())) {
     result.attributes.append(
@@ -2696,6 +2704,9 @@
       return emitOpError("expected #1 operand dim to match result dim #1");
     if (vRHS.getDimSize(0) != vRES.getDimSize(1))
       return emitOpError("expected #2 operand dim to match result dim #2");
+    if (vRHS.isScalable() != vLHS.isScalable())
+      return emitOpError("expected either all or none of vector operands #1 "
+                         "and #2 to be scalable");
   } else {
     // An AXPY operation.
     if (vRES.getRank() != 1)