diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 1eab725ac64e6..c614fd31a3b00 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -2517,6 +2517,9 @@ class BoUpSLP {
                  "only bundle is marked scheduled");
         }
       }
+
+      assert(Inst->getParent() == FirstInBundle->Inst->getParent() &&
+             "all bundle members must be in same basic block");
     }
 
     /// Returns true if the dependency information has been calculated.