diff --git a/libkholidays/scanholiday.c b/libkholidays/scanholiday.c
index a0958a38..f5a96c03 100644
--- a/libkholidays/scanholiday.c
+++ b/libkholidays/scanholiday.c
@@ -8,7 +8,6 @@
 #define yy_flush_buffer kcal_flush_buffer
 #define yy_load_buffer_state kcal_load_buffer_state
 #define yy_switch_to_buffer kcal_switch_to_buffer
-#define yyin kcalin
 #define yyleng kcalleng
 #define yylex kcallex
 #define yyout kcalout