diff --git a/include/llvm/ADT/SmallPtrSet.h b/include/llvm/ADT/SmallPtrSet.h
index b52aebf7d55..e433c57de74 100644
--- a/include/llvm/ADT/SmallPtrSet.h
+++ b/include/llvm/ADT/SmallPtrSet.h
@@ -271,9 +271,9 @@ public:
     return erase_imp(PtrTraits::getAsVoidPointer(Ptr));
   }
 
-  /// count - Return true if the specified pointer is in the set.
-  bool count(PtrType Ptr) const {
-    return count_imp(PtrTraits::getAsVoidPointer(Ptr));
+  /// count - Return 1 if the specified pointer is in the set, 0 otherwise.
+  unsigned count(PtrType Ptr) const {
+    return count_imp(PtrTraits::getAsVoidPointer(Ptr)) ? 1 : 0;
   }
 
   template <typename IterT>
diff --git a/include/llvm/ADT/SmallSet.h b/include/llvm/ADT/SmallSet.h
index ecd3843cd0a..6f36234cb4d 100644
--- a/include/llvm/ADT/SmallSet.h
+++ b/include/llvm/ADT/SmallSet.h
@@ -47,11 +47,11 @@ public:
     return isSmall() ? Vector.size() : Set.size();
   }
 
-  /// count - Return true if the element is in the set.
-  bool count(const T &V) const {
+  /// count - Return 1 if the element is in the set, 0 otherwise.
+  unsigned count(const T &V) const {
     if (isSmall()) {
       // Since the collection is small, just do a linear search.
-      return vfind(V) != Vector.end();
+      return vfind(V) == Vector.end() ? 0 : 1;
     } else {
       return Set.count(V);
     }
diff --git a/include/llvm/ADT/SparseSet.h b/include/llvm/ADT/SparseSet.h
index 267a340a758..ded48c5746a 100644
--- a/include/llvm/ADT/SparseSet.h
+++ b/include/llvm/ADT/SparseSet.h
@@ -227,10 +227,11 @@ public:
     return const_cast<SparseSet*>(this)->findIndex(KeyIndexOf(Key));
   }
 
-  /// count - Returns true if this set contains an element identified by Key.
+  /// count - Returns 1 if this set contains an element identified by Key,
+  /// 0 otherwise.
   ///
-  bool count(const KeyT &Key) const {
-    return find(Key) != end();
+  unsigned count(const KeyT &Key) const {
+    return find(Key) == end() ? 0 : 1;
   }
 
   /// insert - Attempts to insert a new element.
diff --git a/include/llvm/ADT/StringMap.h b/include/llvm/ADT/StringMap.h
index 0838ebe91f1..f22ce80df72 100644
--- a/include/llvm/ADT/StringMap.h
+++ b/include/llvm/ADT/StringMap.h
@@ -313,6 +313,7 @@ public:
     return GetOrCreateValue(Key).getValue();
   }
 
+  /// count - Return 1 if the element is in the map, 0 otherwise.
   size_type count(StringRef Key) const {
     return find(Key) == end() ? 0 : 1;
   }