diff --git a/apps/mosquitto-prometheus-exporter/Dockerfile b/apps/mosquitto-prometheus-exporter/Dockerfile
index 8fa0c99..e12345c 100644
--- a/apps/mosquitto-prometheus-exporter/Dockerfile
+++ b/apps/mosquitto-prometheus-exporter/Dockerfile
@@ -6,5 +6,6 @@ ENV GOCACHE=/usr/src/gocache
 RUN go env
 WORKDIR /usr/src
 RUN go get github.com/sapcc/mosquitto-exporter
+RUN go mode download
 RUN make -j4 build CGO_ENABLED=0
 RUN ls -al
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