diff --git a/Headers/gnustep/gui/NSButton.h b/Headers/gnustep/gui/NSButton.h
index 74f5d34e4..cedf19842 100644
--- a/Headers/gnustep/gui/NSButton.h
+++ b/Headers/gnustep/gui/NSButton.h
@@ -57,6 +57,9 @@
 //
 - (void)setState:(int)value;
 - (int)state;
+- (BOOL) allowsMixedState;
+- (void) setAllowsMixedState: (BOOL)flag;
+- (void)setNextState;
 
 //
 // Setting the Repeat Interval