diff --git a/Classes/ScrollableGraphView.swift b/Classes/ScrollableGraphView.swift
index 9dc5d18..56e4064 100644
--- a/Classes/ScrollableGraphView.swift
+++ b/Classes/ScrollableGraphView.swift
@@ -981,7 +981,7 @@ fileprivate class SGVQueue<T> {
 
 // We have to be our own data source for interface builder.
 #if TARGET_INTERFACE_BUILDER
-public extension ScrollableGraphView : ScrollableGraphViewDataSource {
+extension ScrollableGraphView : ScrollableGraphViewDataSource {
     
     var numberOfDisplayItems: Int {
         get {