diff --git a/ChangeLog b/ChangeLog
index 4be8eed57..c677e930e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-09-17 Riccardo Mottola <rm@gnu.org>
+
+	* Source/NSAnimation.m
+	Warning fix.
+
 2013-09-16  Fred Kiefer <FredKiefer@gmx.de>
 
 	* Source/NSBrowser.m (-setPath:): Fixed a bug where setting the
diff --git a/Source/NSAnimation.m b/Source/NSAnimation.m
index 2d43193e9..51e33a0c5 100644
--- a/Source/NSAnimation.m
+++ b/Source/NSAnimation.m
@@ -534,7 +534,7 @@ nsanimation_progressMarkSorter(NSAnimationProgress first, NSAnimationProgress se
 
 - (void) removeProgressMark: (NSAnimationProgress)progress
 {
-  unsigned index;
+  NSUInteger index;
   _NSANIMATION_LOCKING_SETUP;
 
   _NSANIMATION_LOCK;
@@ -547,8 +547,8 @@ nsanimation_progressMarkSorter(NSAnimationProgress first, NSAnimationProgress se
       GSIArrayRemoveItemAtIndex(_progressMarks,index);
       _isCachedProgressMarkNumbersValid = NO;
       if (_nextMark > index) _nextMark--;
-      NSDebugMLLog(@"NSAnimationMark",@"Remove mark #%d for (next:#%d)",
-                   index, progress, _nextMark);
+      NSDebugMLLog(@"NSAnimationMark",@"Remove mark #%lu (%f) for (next:#%d)",
+                   (unsigned long)index, progress, _nextMark);
     }
   else
     NSWarnMLog(@"Unexistent progress mark");