diff --git a/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp b/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
index 4f350ea236da8..8d01ea5ca2148 100644
--- a/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
+++ b/mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp
@@ -160,7 +160,7 @@ static void fillStructuredOpRegion(OpBuilder &opBuilder, Region &region,
 static SmallVector<AffineMap>
 getDefaultIndexingMapsForMatmul(MLIRContext *context) {
   AffineExpr d0, d1, d2;
-  SmallVector<AffineMap, 3> indexingMaps;
+  SmallVector<AffineMap, 6> indexingMaps;
   bindDims(context, d0, d1, d2);
   indexingMaps.push_back(AffineMap::get(3, 0, {d0, d2}, context));
   indexingMaps.push_back(AffineMap::get(3, 0, {d2, d1}, context));