diff --git a/Dockerfile b/Dockerfile
index a504173..d629af1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,7 +35,7 @@ RUN --mount=from=binary,target=/build \
   && tar -czvf "/out/wait4x-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}.tar.gz" * \
   # Change dir to "/out" to prevent adding "/out" in the sha256sum command output.
   && cd /out \
-  && sha256sum -z "wait4x-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}.tar.gz" > "wait4x-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}.tar.gz.sha256sum"
+  && sha256sum "wait4x-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}.tar.gz" > "wait4x-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}.tar.gz.sha256sum"
 
 FROM scratch AS artifact
 COPY --from=releaser /out /