diff --git a/windows/windCmdNR.c b/windows/windCmdNR.c
index b550bd2e..a9a33cb0 100644
--- a/windows/windCmdNR.c
+++ b/windows/windCmdNR.c
@@ -168,7 +168,7 @@ windPauseCmd(w, cmd)
 }
 
 
-char *butTable[] =
+const char * const butTable[] =
 {
     "left",
     "middle",
@@ -176,7 +176,7 @@ char *butTable[] =
     0
 };
 
-char *actTable[] =
+const char * const actTable[] =
 {
     "down",
     "up",
diff --git a/windows/windInt.h b/windows/windInt.h
index 0070089e..002b62bb 100644
--- a/windows/windInt.h
+++ b/windows/windInt.h
@@ -45,8 +45,8 @@ typedef struct WIND_S3 {
 extern MagWindow *windTopWindow;
 extern MagWindow *windBottomWindow;
 extern clientRec *windFirstClientRec;
-extern char *butTable[];
-extern char *actTable[];
+extern const char * const butTable[];
+extern const char * const actTable[];
 extern bool windPrintCommands;
 
 /* ----------------- procedures ----------------- */