diff --git a/SoObjects/SOGo/NSString+Utilities.m b/SoObjects/SOGo/NSString+Utilities.m
index bb8ece23c..3cab55fb1 100644
--- a/SoObjects/SOGo/NSString+Utilities.m
+++ b/SoObjects/SOGo/NSString+Utilities.m
@@ -24,6 +24,8 @@
 #import <Foundation/NSCharacterSet.h>
 #import <Foundation/NSEnumerator.h>
 
+#import <NGExtensions/NGQuotedPrintableCoding.h>
+
 #import "NSArray+Utilities.h"
 #import "NSDictionary+URL.h"