diff --git a/src/error.h b/src/error.h
deleted file mode 100644
index eb755ec7f..000000000
--- a/src/error.h
+++ /dev/null
@@ -1,3 +0,0 @@
-/* this header file is to be removed soon.
-   added for compatibility purpose (1.0.0) */
-#include <mruby/error.h>