diff --git a/lib/Transforms/IPO/Inliner.cpp b/lib/Transforms/IPO/Inliner.cpp
index 07918543d40..6c732d21f28 100644
--- a/lib/Transforms/IPO/Inliner.cpp
+++ b/lib/Transforms/IPO/Inliner.cpp
@@ -333,6 +333,10 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
 
   DEBUG(dbgs() << ": " << CallSites.size() << " call sites.\n");
 
+  // If there are no calls in this function, exit early.
+  if (CallSites.empty())
+    return false;
+  
   // Now that we have all of the call sites, move the ones to functions in the
   // current SCC to the end of the list.
   unsigned FirstCallInSCC = CallSites.size();