diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
index 4d1a3e6..739e57c 100644
--- a/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -453,10 +453,10 @@
     // If we have a previous stack frame, and we have a previous call, 
     // fill in the return value... 
     ExecutionContext &CallingSF = ECStack.back();
-    if (CallingSF.Caller) {
-      if (CallingSF.Caller->getType() != Type::VoidTy)      // Save result...
-        SetValue(CallingSF.Caller, Result, CallingSF);
-      CallingSF.Caller = 0;          // We returned from the call...
+    if (CallingSF.Caller.getInstruction()) {
+      if (CallingSF.Caller.getType() != Type::VoidTy)      // Save result...
+        SetValue(CallingSF.Caller.getInstruction(), Result, CallingSF);
+      CallingSF.Caller = CallSite();          // We returned from the call...
     }
   }
 }
@@ -639,7 +639,7 @@
 
 void Interpreter::visitCallInst(CallInst &I) {
   ExecutionContext &SF = ECStack.back();
-  SF.Caller = &I;
+  SF.Caller = CallSite(&I);
   std::vector<GenericValue> ArgVals;
   ArgVals.reserve(I.getNumOperands()-1);
   for (unsigned i = 1; i < I.getNumOperands(); ++i) {
@@ -804,8 +804,8 @@
 //
 void Interpreter::callFunction(Function *F,
                                const std::vector<GenericValue> &ArgVals) {
-  assert((ECStack.empty() || ECStack.back().Caller == 0 || 
-	  ECStack.back().Caller->getNumOperands()-1 == ArgVals.size()) &&
+  assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 || 
+	  ECStack.back().Caller.arg_size() == ArgVals.size()) &&
 	 "Incorrect number of arguments passed into function call!");
   // Make a new stack frame... and fill it in.
   ECStack.push_back(ExecutionContext());
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
index 08d910b..06e8257 100644
--- a/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -18,6 +18,7 @@
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
 #include "llvm/Support/InstVisitor.h"
+#include "llvm/Support/CallSite.h"
 #include "llvm/Target/TargetData.h"
 #include "Support/DataTypes.h"
 
@@ -64,8 +65,8 @@
   BasicBlock::iterator  CurInst;    // The next instruction to execute
   std::map<Value *, GenericValue> Values; // LLVM values used in this invocation
   std::vector<GenericValue>  VarArgs; // Values passed through an ellipsis
-  CallInst             *Caller;     // Holds the call that called subframes.
-                                    // NULL if main func or debugger invoked fn
+  CallSite             Caller;     // Holds the call that called subframes.
+                                   // NULL if main func or debugger invoked fn
   AllocaHolderHandle    Allocas;    // Track memory allocated by alloca
 };