diff --git a/Headers/gnustep/base/NSArray.h b/Headers/gnustep/base/NSArray.h
index 9ab1d1920..afe030d34 100644
--- a/Headers/gnustep/base/NSArray.h
+++ b/Headers/gnustep/base/NSArray.h
@@ -89,6 +89,7 @@
 - (NSString*) descriptionWithLocale: (NSDictionary*)locale
 			     indent: (unsigned int)level;
 
+- (BOOL) writeToFile: (NSString*)path atomically: (BOOL)useAuxilliaryFile;
 @end