diff --git a/src/http/modules/perl/ngx_http_perl_module.c b/src/http/modules/perl/ngx_http_perl_module.c
index 3006a07..b11320d 100644
--- a/src/http/modules/perl/ngx_http_perl_module.c
+++ b/src/http/modules/perl/ngx_http_perl_module.c
@@ -459,6 +459,11 @@
 #if !(NGX_HAVE_PERL_MULTIPLICITY)
 
     if (perl) {
+
+        if (ngx_set_environment(cf->cycle, NULL) == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
         if (ngx_http_perl_run_requires(aTHX_ &pmcf->requires, cf->log)
             != NGX_OK)
         {