diff --git a/include/llvm/PassManagers.h b/include/llvm/PassManagers.h
index 1f00b3ebce1..ce34f31fc07 100644
--- a/include/llvm/PassManagers.h
+++ b/include/llvm/PassManagers.h
@@ -184,7 +184,7 @@ public:
   void schedulePass(Pass *P);
 
   /// Set pass P as the last user of the given analysis passes.
-  void setLastUser(SmallVectorImpl<Pass *> &AnalysisPasses, Pass *P);
+  void setLastUser(const SmallVectorImpl<Pass *> &AnalysisPasses, Pass *P);
 
   /// Collect passes whose last user is P
   void collectLastUses(SmallVectorImpl<Pass *> &LastUses, Pass *P);
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index 39925c948a5..c1f1d5a26ca 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -497,9 +497,10 @@ PMTopLevelManager::PMTopLevelManager(PMDataManager *PMDM) {
 }
 
 /// Set pass P as the last user of the given analysis passes.
-void PMTopLevelManager::setLastUser(SmallVectorImpl<Pass *> &AnalysisPasses,
-                                    Pass *P) {
-  for (SmallVectorImpl<Pass *>::iterator I = AnalysisPasses.begin(),
+void
+PMTopLevelManager::setLastUser(const SmallVectorImpl<Pass *> &AnalysisPasses,
+                               Pass *P) {
+  for (SmallVectorImpl<Pass *>::const_iterator I = AnalysisPasses.begin(),
          E = AnalysisPasses.end(); I != E; ++I) {
     Pass *AP = *I;
     LastUser[AP] = P;