diff --git a/sponsorblockcast/Dockerfile b/sponsorblockcast/Dockerfile
index feda99e2c..2e5e308bf 100644
--- a/sponsorblockcast/Dockerfile
+++ b/sponsorblockcast/Dockerfile
@@ -24,7 +24,7 @@ VOLUME [ "/data" ]
 
 # shellcheck ignore=DL4006
 RUN apk --no-cache add jq bc grep curl \
-    && GC_URL='wget https://api.github.com/repos/vishen/go-chromecast/releases/latest -O - | jq -r '.assets[].browser_download_url' | grep ${TARGETOS}_${TARGETARCH}${TARGETVARIANT}' \
+    && GC_URL=$(wget https://api.github.com/repos/vishen/go-chromecast/releases/latest -O - | jq -r '.assets[].browser_download_url' | grep ${TARGETOS}_${TARGETARCH}${TARGETVARIANT}) \
     && wget $GC_URL -O /root/go-chromecast.tgz \
     && tar xzf /root/go-chromecast.tgz -C /usr/bin \
     && rm -rf /root/* \