diff --git a/ChangeLog b/ChangeLog
index 3a81b97..e080b2b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,8 @@
 2010-11-11 Riccardo Mottola
 
 	* GSCache.m
-	use always class_getInstanceSize() on GNUSTEP for all runtimes and define a compatibility macro for old macs
+	use always class_getInstanceSize() on GNUSTEP for all runtimes
+	and define a compatibility macro for old macs
 
 	* GSThreadPool.h
 	* GSLinkedList.h
diff --git a/GSThreadPool.h b/GSThreadPool.h
index 23399ce..8473e52 100644
--- a/GSThreadPool.h
+++ b/GSThreadPool.h
@@ -23,9 +23,9 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
    */
 #import <Foundation/NSObject.h>
-#import <Foundation/NSDate.h>
 
 @class	GSLinkedList;
+@class	NSDate;
 @class	NSLock;
 
 /** This class provides a thread pool for performing methods
diff --git a/GSThroughput.h b/GSThroughput.h
index 70498bd..be65d7e 100644
--- a/GSThroughput.h
+++ b/GSThroughput.h
@@ -27,8 +27,9 @@
 #define	INCLUDED_GSThroughput_H
 
 #import	<Foundation/NSObject.h>
-#import	<Foundation/NSArray.h>
 
+@class	NSArray;
+@class	NSString;
 
 extern NSString * const GSThroughputNotification;
 extern NSString * const GSThroughputCountKey;
diff --git a/GSTicker.h b/GSTicker.h
index 433fa29..1acb6c8 100644
--- a/GSTicker.h
+++ b/GSTicker.h
@@ -26,7 +26,7 @@
 #ifndef	INCLUDED_GSTicker_H
 #define	INCLUDED_GSTicker_H
 
-#import	<Foundation/NSDate.h>
+@class	NSDate;
 
 /**
  * Returns the timestamp of the most recent call to GSTickerTimeNow().