diff --git a/Source/Additions/NSProcessInfo+GNUstepBase.m b/Source/Additions/NSProcessInfo+GNUstepBase.m
index f1ca7fe3c..9823e25a0 100644
--- a/Source/Additions/NSProcessInfo+GNUstepBase.m
+++ b/Source/Additions/NSProcessInfo+GNUstepBase.m
@@ -29,6 +29,8 @@
 #import "Foundation/NSSet.h"
 #import "GNUstepBase/NSProcessInfo+GNUstepBase.h"
 
+#include <stdio.h>
+
 @implementation NSProcessInfo(GNUstepBase)
 
 static NSMutableSet	*_debug_set = nil;