diff --git a/CHANGES b/CHANGES
index 6befd52f3f..cf82d91834 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+2549.	[port]		linux: define NR_OPEN if not currently defined.
+			[RT #19344]
+
 2548.	[bug]		Install iterated_hash.h. [RT #19335]
 
 2547.	[bug]		openssl_link.c:mem_realloc() could reference an
diff --git a/lib/isc/unix/resource.c b/lib/isc/unix/resource.c
index 0970e4ed33..6e8e0aa997 100644
--- a/lib/isc/unix/resource.c
+++ b/lib/isc/unix/resource.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: resource.c,v 1.21 2008/08/05 07:04:49 marka Exp $ */
+/* $Id: resource.c,v 1.22 2009/02/13 09:15:18 marka Exp $ */
 
 #include <config.h>
 
@@ -159,7 +159,11 @@ isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value) {
 		if (unixresult == 0)
 			return (ISC_R_SUCCESS);
 	}
-#elif defined(NR_OPEN) && defined(__linux__)
+#elif defined(__linux__)
+#ifndef NR_OPEN
+#define NR_OPEN (1024*1024)
+#endif
+
 	/*
 	 * Some Linux kernels don't accept RLIM_INFINIT; the maximum
 	 * possible value is the NR_OPEN defined in linux/fs.h.