diff --git a/src/ios/PSPDFThreadSafeMutableDictionary.m b/src/ios/PSPDFThreadSafeMutableDictionary.m
index f8c53e210..2b39604b9 100644
--- a/src/ios/PSPDFThreadSafeMutableDictionary.m
+++ b/src/ios/PSPDFThreadSafeMutableDictionary.m
@@ -23,9 +23,11 @@
 
 #import <Foundation/Foundation.h>
 
+/* ** ALREADY INCLUDED BY #import "PSPDFThreadSafeMutableDictionary.h"
 // Dictionary-Subclasss whose primitive operations are thread safe.
 @interface PSPDFThreadSafeMutableDictionary : NSMutableDictionary
 @end
+// */
 
 // ----------------------------------------------------------------