diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 1f4538a..0c4d850 100644
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -772,9 +772,9 @@
   case Instruction::ICmp:
   case Instruction::FCmp: assert(0 && "Invalid for compares");
   case Instruction::Call:
-    if (Function *F = dyn_cast<Function>(Ops[0]))
+    if (Function *F = dyn_cast<Function>(Ops[CallInst::ArgOffset ? 0:NumOps-1]))
       if (canConstantFoldCallTo(F))
-        return ConstantFoldCall(F, Ops+1, NumOps-1);
+        return ConstantFoldCall(F, Ops+CallInst::ArgOffset, NumOps-1);
     return 0;
   case Instruction::PtrToInt:
     // If the input is a inttoptr, eliminate the pair.  This requires knowing