diff --git a/src/misc2.c b/src/misc2.c
index c23c689..6641a27 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -1561,7 +1561,7 @@
 	key = Ctrl_chr(key);
 	modifiers &= ~MOD_MASK_CTRL;
 	// <C-@> is <Nul>
-	if (key == 0)
+	if (key == NUL)
 	    key = K_ZERO;
 	if (did_simplify != NULL)
 	    *did_simplify = TRUE;