diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index b485123cb7b1..2437c4f379c0 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,9 @@
+2008-07-22  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR libfortran/36890
+	* io/file_pos.c:  Declare READ_CHUNK as signed to avoid
+	signed/unsigned comparison warning in formatted_backspace.
+
 2008-07-21  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR libfortran/36773
diff --git a/libgfortran/io/file_pos.c b/libgfortran/io/file_pos.c
index f4864884f331..89c67365429a 100644
--- a/libgfortran/io/file_pos.c
+++ b/libgfortran/io/file_pos.c
@@ -39,7 +39,7 @@ Boston, MA 02110-1301, USA.  */
    record, and we have to sift backwards to find the newline before
    that or the start of the file, whichever comes first.  */
 
-static const unsigned int READ_CHUNK = 4096;
+static const int READ_CHUNK = 4096;
 
 static void
 formatted_backspace (st_parameter_filepos *fpp, gfc_unit *u)