diff --git a/src/vim.h b/src/vim.h
index 265720a..5fb0481 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2243,4 +2243,7 @@
 #define SREQ_WIN	1	/* Request window-local option */
 #define SREQ_BUF	2	/* Request buffer-local option */
 
+/* Character used as separated in autoload function/variable names. */
+#define AUTOLOAD_CHAR '#'
+
 #endif /* VIM__H */