diff --git a/gnu/lib/libmalloc/mem-limits.h b/gnu/lib/libmalloc/mem-limits.h
index a6317123786f..074831292de0 100644
--- a/gnu/lib/libmalloc/mem-limits.h
+++ b/gnu/lib/libmalloc/mem-limits.h
@@ -24,7 +24,7 @@ Cambridge, MA 02139, USA.  */
 #include <sys/resource.h>
 #endif
 
-#if defined(__bsdi__) && defined(__NetBSD__)
+#if defined(__bsdi__) || defined(__NetBSD__)
 #define BSD4_2
 #endif