diff --git a/lib/IR/Verifier.cpp b/lib/IR/Verifier.cpp
index d42ca31b5aa..05600155a8c 100644
--- a/lib/IR/Verifier.cpp
+++ b/lib/IR/Verifier.cpp
@@ -1176,6 +1176,10 @@ void Verifier::visitBasicBlock(BasicBlock &BB) {
       }
     }
   }
+
+  // Check that all instructions have their parent pointers set up correctly.
+  for (auto &I: BB)
+    Assert(I.getParent() == &BB, "Instruction has bogus parent pointer!");
 }
 
 void Verifier::visitTerminatorInst(TerminatorInst &I) {