diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c5ba1345cbf..f2b124ce0ef 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2010-03-19  Stan Shebs  <stan@codesourcery.com>
+
+	* ax-general.c (ax_const_l): Fix a sizing bug. 
+
 2010-03-18  Joel Brobecker  <brobecker@adacore.com>
 
 	GDB 7.1 released.
diff --git a/gdb/ax-general.c b/gdb/ax-general.c
index e2ceb3de706..69a26d23080 100644
--- a/gdb/ax-general.c
+++ b/gdb/ax-general.c
@@ -231,7 +231,7 @@ ax_const_l (struct agent_expr *x, LONGEST l)
      use the shortest representation.  */
   for (op = 0, size = 8; size < 64; size *= 2, op++)
     {
-      LONGEST lim = 1 << (size - 1);
+      LONGEST lim = ((LONGEST) 1) << (size - 1);
 
       if (-lim <= l && l <= lim - 1)
         break;