diff --git a/exporter.v b/exporter.v
deleted file mode 100644
index 971986c..0000000
--- a/exporter.v
+++ /dev/null
@@ -1 +0,0 @@
-module metrics
diff --git a/prometheus.v b/prometheus.v
index cc50f9a..49e70c0 100644
--- a/prometheus.v
+++ b/prometheus.v
@@ -7,7 +7,7 @@ import arrays
 pub struct PrometheusExporter {
 	buckets []f64
 mut:
-	collector MetricsCollector
+	collector &MetricsCollector = unsafe { nil }
 }
 
 pub fn new_prometheus_exporter(buckets []f64) PrometheusExporter {
@@ -16,8 +16,10 @@ pub fn new_prometheus_exporter(buckets []f64) PrometheusExporter {
 	}
 }
 
-pub fn (mut e PrometheusExporter) load(collector MetricsCollector) {
-	e.collector = collector
+pub fn (mut e PrometheusExporter) load(collector &MetricsCollector) {
+	unsafe {
+		e.collector = collector
+	}
 }
 
 pub fn (mut e PrometheusExporter) export_to_string() !string {