diff --git a/k&r/04-funcs-and-prog-struct/04-calc/04-tokens.h b/k&r/04-funcs-and-prog-struct/04-calc/04-tokens.h
index 697a089..11cc0d0 100644
--- a/k&r/04-funcs-and-prog-struct/04-calc/04-tokens.h
+++ b/k&r/04-funcs-and-prog-struct/04-calc/04-tokens.h
@@ -18,7 +18,7 @@
 /* unary function */
 #define UNARY_FUN(F) push(F(pop()))
 /* unary function with tests */
-#define UNARY_T_FUN(F, T, ...) \
+#define UNARY_T_FUN(F, ...) \
     do { double op = pop(); __VA_ARGS__ push(F(op)); } while (0)
 /* commutative function */
 #define COMM_FUN(F) push(F(pop(), pop()))