diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 043691cf071..64cc5a8abee 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -366,6 +366,10 @@ FastISel::SelectInstruction(Instruction *I) {
     return false;
   }
 
+  case Instruction::Unreachable:
+    // Nothing to emit.
+    return true;
+
   case Instruction::PHI:
     // PHI nodes are already emitted.
     return true;