diff --git a/acconfig.h b/acconfig.h
index a1889ae1a..1dc6b89f1 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -28,13 +28,6 @@
 
 /* random defines */
 
-/*
- * Defining this enables lots of useful (and used) extensions on
- * glibc-based systems such as Linux
- */
-
-#define _GNU_SOURCE
-
 /*
  * this assumes that KRB_C_BIGENDIAN is used.
  * if we can find out endianess at compile-time, do so,