diff --git a/src/doom/m_menu.c b/src/doom/m_menu.c
index 59023fd7..8015f431 100644
--- a/src/doom/m_menu.c
+++ b/src/doom/m_menu.c
@@ -939,7 +939,7 @@ void M_Episode(int choice)
 // M_Options
 //
 static const char *detailNames[2] = {"M_GDHIGH","M_GDLOW"};
-static char *msgNames[2] = {"M_MSGOFF","M_MSGON"};
+static const char *msgNames[2] = {"M_MSGOFF","M_MSGON"};
 
 void M_DrawOptions(void)
 {