1 files changed, 1 insertions, 1 deletions
diff --git a/tbl/t0.c b/tbl/t0.c
index 8b59c2b4fdd8..93e919b67240 100644
--- a/tbl/t0.c
+++ b/tbl/t0.c
@@ -69,7 +69,7 @@ int *linestop;	/* linestop[MAXLIN] */
 int *topat;	/* topat[MAXLIN] */
 int nlin, ncol;
 int iline = 1;
-char *ifile = "Input";
+const char *ifile = "Input";
 intptr_t texname = 'a';
 int texct = 0;
 int texct2 = -1;