1 files changed, 1 insertions, 1 deletions
diff --git a/src/ptx.c b/src/ptx.c
index 174b3478b..cdc65137e 100644
--- a/src/ptx.c
+++ b/src/ptx.c
@@ -69,7 +69,7 @@
 #define Sword 1
 
 /* The name this program was run with. */
-char *program_name;
+char const *program_name;
 
 /* Program options.  */