diff --git a/DataStructures/BinaryHeap.h b/DataStructures/BinaryHeap.h
index c332eadc8..f99f09b8e 100644
--- a/DataStructures/BinaryHeap.h
+++ b/DataStructures/BinaryHeap.h
@@ -56,7 +56,7 @@ template< typename NodeID, typename Key >
 class MapStorage {
 public:
 
-    MapStorage( size_t size = 0 ) {}
+    MapStorage( size_t ) {}
 
     Key &operator[]( NodeID node ) {
         return nodes[node];
@@ -75,7 +75,7 @@ template< typename NodeID, typename Key >
 class UnorderedMapStorage {
 public:
 
-	UnorderedMapStorage( size_t size = 0 ) {  }
+	UnorderedMapStorage( size_t ) {  }
 
     Key &operator[]( NodeID node ) {
         return nodes[node];