diff --git a/lib/Transforms/IPO/StructRetPromotion.cpp b/lib/Transforms/IPO/StructRetPromotion.cpp
index 6659c5a51e4..feb5be64f81 100644
--- a/lib/Transforms/IPO/StructRetPromotion.cpp
+++ b/lib/Transforms/IPO/StructRetPromotion.cpp
@@ -73,7 +73,7 @@ bool SRETPromotion::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
 bool SRETPromotion::PromoteReturn(CallGraphNode *CGN) {
   Function *F = CGN->getFunction();
 
-  if (!F)
+  if (!F || F->isDeclaration())
     return false;
 
   // Make sure that function returns struct.