diff --git a/src/http/ngx_http_variables.h b/src/http/ngx_http_variables.h
index d2bb4db88..829fab31e 100644
--- a/src/http/ngx_http_variables.h
+++ b/src/http/ngx_http_variables.h
@@ -57,9 +57,6 @@ ngx_int_t ngx_http_variable_unknown_header(ngx_http_variable_value_t *v,
     ngx_str_t *var, ngx_list_part_t *part, size_t prefix);
 
 
-#define ngx_http_clear_variable(r, index) r->variables0[index].text.data = NULL;
-
-
 #if (NGX_PCRE)
 
 typedef struct {