diff --git a/Dockerfile b/Dockerfile
index 1baef03..dcfe898 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ RUN wget https://github.com/pgaskin/kepubify/releases/download/v4.0.4/kepubify-l
 
 # Download and install kindlegen
 RUN wget https://github.com/zzet/fp-docker/raw/f2b41fb0af6bb903afd0e429d5487acc62cb9df8/kindlegen_linux_2.6_i386_v2_9.tar.gz && \
-    echo "9828db5a2c8970d487ada2caa91a3b6403210d5d183a7e3849b1b206ff042296 kindlegen_linux_2.6_i386_v2_9.tar.gz" | sha256sum --check --status \
+    echo "9828db5a2c8970d487ada2caa91a3b6403210d5d183a7e3849b1b206ff042296 kindlegen_linux_2.6_i386_v2_9.tar.gz" | sha256sum -c && \
     mkdir kindlegen && \
     tar xvf kindlegen_linux_2.6_i386_v2_9.tar.gz --directory kindlegen && \
     cp kindlegen/kindlegen /usr/local/bin/kindlegen && \