diff --git a/GSFIFO.h b/GSFIFO.h
index ac26442..fd248c5 100644
--- a/GSFIFO.h
+++ b/GSFIFO.h
@@ -23,6 +23,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
    */
 #import <Foundation/NSObject.h>
+#import <Foundation/NSDate.h>
 
 @class NSArray;
 @class NSCondition;