diff --git a/libf2c/arithchk.c b/libf2c/arithchk.c
index 8e15722..a1a03ac 100644
--- a/libf2c/arithchk.c
+++ b/libf2c/arithchk.c
@@ -110,7 +110,7 @@ icheck(void)
return 0;
}
-char *emptyfmt = ""; /* avoid possible warning message with printf("") */
+const char emptyfmt[] = ""; /* avoid possible warning message with printf("") */
static Akind *
ccheck(void)