diff --git a/ChangeLog b/ChangeLog
index 489320ec87..10e137892d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2005-08-08  Ulrich Drepper  <drepper@redhat.com>
+
+	* nscd/mem.c (mempool_alloc): Use posix_fallocate instead of ftruncate.
+	* nscd/connections.c (nscd_init): Likewise.
+
 2005-08-08  Jakub Jelinek  <jakub@redhat.com>
 
 	* stdio-common/fxprintf.c: Include libioP.h.
diff --git a/nscd/connections.c b/nscd/connections.c
index 808ea33adb..7ead3fd5e7 100644
--- a/nscd/connections.c
+++ b/nscd/connections.c
@@ -638,7 +638,7 @@ cannot create read-only descriptor for \"%s\"; no mmap"),
 
 		if ((TEMP_FAILURE_RETRY (write (fd, &head, sizeof (head)))
 		     != sizeof (head))
-		    || ftruncate (fd, total) != 0
+		    || posix_fallocate (fd, 0, total) != 0
 		    || (mem = mmap (NULL, total, PROT_READ | PROT_WRITE,
 				    MAP_SHARED, fd, 0)) == MAP_FAILED)
 		  {
diff --git a/nscd/mem.c b/nscd/mem.c
index a1108f3143..823eda1019 100644
--- a/nscd/mem.c
+++ b/nscd/mem.c
@@ -21,6 +21,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <error.h>
+#include <fcntl.h>
 #include <inttypes.h>
 #include <libintl.h>
 #include <limits.h>
@@ -488,7 +489,8 @@ mempool_alloc (struct database_dyn *db, size_t len)
 			     + db->head->module * sizeof (ref_t)
 			     + new_data_size);
 
-	  if ((!db->mmap_used || ftruncate (db->wr_fd, newtotal) != 0)
+	  if ((!db->mmap_used
+	       || posix_fallocate (db->wr_fd, oldtotal, newtotal) != 0)
 	      /* Try to resize the mapping.  Note: no MREMAP_MAYMOVE.  */
 	      && mremap (db->head, oldtotal, newtotal, 0) == 0)
 	    {