diff --git a/Source/Additions/NSThread+GNUstepBase.m b/Source/Additions/NSThread+GNUstepBase.m
index 14256e051..d07c2048d 100644
--- a/Source/Additions/NSThread+GNUstepBase.m
+++ b/Source/Additions/NSThread+GNUstepBase.m
@@ -24,6 +24,7 @@
 */
 
 #import "common.h"
+#import <Foundation/NSThread.h>
 
 #if	defined(__APPLE__)