diff --git a/joal/Dockerfile b/joal/Dockerfile
index e13611bc5..1f2113912 100644
--- a/joal/Dockerfile
+++ b/joal/Dockerfile
@@ -28,10 +28,10 @@ FROM anthonyraymond/joal:$BUILD_UPSTREAM
 # hadolint ignore=SC2015,DL4006
 RUN \
     if ! command -v curl >/dev/null 2>/dev/null; then (apt-get update && apt-get install -yqq --no-install-recommends curl || apk add --no-cache curl); fi \
-    && curl -s -S -J -L -o /tmp/joal.tar.gz $(curl -s https://api.github.com/repos/anthonyraymond/joal/releases/latest | grep -o "http.*joal.tar.gz") >/dev/null \
+    && curl -s -S -J -L -o /tmp/joal.tar.gz "$(curl -s https://api.github.com/repos/anthonyraymond/joal/releases/latest | grep -o "http.*joal.tar.gz")" >/dev/null \
     && mkdir -p /data/joal \
     && tar zxvf /tmp/joal.tar.gz -C /data/joal >/dev/null \
-    && chown -R "$(id -u):$(id -g)" /data/joal \
+    && chown -R "$(id -u)":"$(id -g)" /data/joal \
     && rm /data/joal/jack-of* || true
 
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