diff --git a/include/llvm/Analysis/CaptureTracking.h b/include/llvm/Analysis/CaptureTracking.h
index 9b5e8425ad2..2889269b957 100644
--- a/include/llvm/Analysis/CaptureTracking.h
+++ b/include/llvm/Analysis/CaptureTracking.h
@@ -46,7 +46,7 @@ namespace llvm {
     /// capture) return false. To search it, return true.
     ///
     /// U->getUser() is always an Instruction.
-    virtual bool shouldExplore(Use *U) = 0;
+    virtual bool shouldExplore(Use *U);
 
     /// captured - Information about the pointer was captured by the user of
     /// use U. Return true to stop the traversal or false to continue looking
diff --git a/lib/Analysis/CaptureTracking.cpp b/lib/Analysis/CaptureTracking.cpp
index 974b906b34e..d9c02990a80 100644
--- a/lib/Analysis/CaptureTracking.cpp
+++ b/lib/Analysis/CaptureTracking.cpp
@@ -23,6 +23,8 @@ using namespace llvm;
 
 CaptureTracker::~CaptureTracker() {}
 
+bool CaptureTracker::shouldExplore(Use *U) { return true; }
+
 namespace {
   struct SimpleCaptureTracker : public CaptureTracker {
     explicit SimpleCaptureTracker(bool ReturnCaptures)
@@ -30,8 +32,6 @@ namespace {
 
     void tooManyUses() { Captured = true; }
 
-    bool shouldExplore(Use *U) { return true; }
-
     bool captured(Use *U) {
       if (isa<ReturnInst>(U->getUser()) && !ReturnCaptures)
         return false;
diff --git a/lib/Transforms/IPO/FunctionAttrs.cpp b/lib/Transforms/IPO/FunctionAttrs.cpp
index f974bd0c045..0e16589ecec 100644
--- a/lib/Transforms/IPO/FunctionAttrs.cpp
+++ b/lib/Transforms/IPO/FunctionAttrs.cpp
@@ -276,8 +276,6 @@ namespace {
 
     void tooManyUses() { Captured = true; }
 
-    bool shouldExplore(Use *U) { return true; }
-
     bool captured(Use *U) {
       CallSite CS(U->getUser());
       if (!CS.getInstruction()) { Captured = true; return true; }