diff --git a/SOPE/NGCards/iCalTimeZonePeriod.m b/SOPE/NGCards/iCalTimeZonePeriod.m
index 03d6cb4b3..d157720b6 100644
--- a/SOPE/NGCards/iCalTimeZonePeriod.m
+++ b/SOPE/NGCards/iCalTimeZonePeriod.m
@@ -22,6 +22,7 @@
 
 #import <Foundation/NSCalendarDate.h>
 #import <Foundation/NSString.h>
+#import <Foundation/NSTimeZone.h>
 
 #import "iCalDateTime.h"
 #import "iCalRecurrenceRule.h"