1 files changed, 3 insertions, 1 deletions
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index 041fe2eb4f..edd6a73b08 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -261,7 +261,9 @@ bool Constant::isThreadDependent() const {
     }
 
     for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
-      const Constant *D = cast<Constant>(C->getOperand(I));
+      const Constant *D = dyn_cast<Constant>(C->getOperand(I));
+      if (!D)
+        continue;
       if (Visited.insert(D))
         WorkList.push_back(D);
     }