X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/9657ac3d30e1c8d3aefa13054af5851fe2f3c3d2..9874c9d73cf26eb21a7b9f69127df13ee09af2fc:/terminal.c

diff --git a/terminal.c b/terminal.c
index 19d5a750..4f0d8225 100644
--- a/terminal.c
+++ b/terminal.c
@@ -5942,7 +5942,7 @@ void term_key(Terminal *term, Key_Sym keysym, wchar_t *text, size_t tlen,
 		if (modifiers & PKM_CONTROL)
 		    c &= 0x1f;
 		else if (modifiers & PKM_SHIFT)
-		    c = toupper(c);
+			c = toupper((unsigned char)c);
 	    }
 	    *p++ = c;
 	    goto done;