diff --git a/ext2sim/ext2sim.c b/ext2sim/ext2sim.c
index 6e4341d9..0fbb31da 100644
--- a/ext2sim/ext2sim.c
+++ b/ext2sim/ext2sim.c
@@ -13,7 +13,7 @@
  */
 
 #ifndef lint
-static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/ext2sim/ext2sim.c,v 1.2 2008/12/03 14:12:09 tim Exp $";
+static const char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/ext2sim/ext2sim.c,v 1.2 2008/12/03 14:12:09 tim Exp $";
 #endif  /* not lint */
 
 #include <stdio.h>