diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index b18ddba3088b4d..6346406b091a44 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -1966,9 +1966,10 @@ class BoUpSLP {
       if (Operands.size() < OpIdx + 1)
         Operands.resize(OpIdx + 1);
       assert(Operands[OpIdx].empty() && "Already resized?");
-      Operands[OpIdx].resize(Scalars.size());
-      for (unsigned Lane = 0, E = Scalars.size(); Lane != E; ++Lane)
-        Operands[OpIdx][Lane] = OpVL[Lane];
+      assert(OpVL.size() <= Scalars.size() &&
+             "Number of operands is greater than the number of scalars.");
+      Operands[OpIdx].resize(OpVL.size());
+      copy(OpVL, Operands[OpIdx].begin());
     }
 
     /// Set the operands of this bundle in their original order.