diff --git a/ChangeLog b/ChangeLog
index 32fa5498..0c44e980 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-08-28  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* lib/nscd.c: Avoid redefinition of _GNU_SOURCE.
+
 2008-08-28  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* configure.in: Indentation fix.
diff --git a/lib/nscd.c b/lib/nscd.c
index f8726706..d7fa2d58 100644
--- a/lib/nscd.c
+++ b/lib/nscd.c
@@ -4,7 +4,9 @@
 #ifdef USE_NSCD
 
 /* because of TEMP_FAILURE_RETRY */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 
 #include <features.h>
 #include <stdio.h>