diff --git a/Dockerfile b/Dockerfile
index df07f78..4267c5b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@ RUN \
 	php7-ctype \
 	php7-pdo_sqlite \
 	php7-tokenizer \
-        php7-zip \
+	php7-zip \
 	tar && \
  echo "**** install heimdall ****" && \
  mkdir -p \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 6f1b65e..f73f611 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -20,7 +20,7 @@ RUN \
 	php7-ctype \
 	php7-pdo_sqlite \
 	php7-tokenizer \
-        php7-zip \
+	php7-zip \
 	tar && \
  echo "**** install heimdall ****" && \
  mkdir -p \
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 32feba6..145a813 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -20,7 +20,7 @@ RUN \
 	php7-ctype \
 	php7-pdo_sqlite \
 	php7-tokenizer \
-        php7-zip \
+	php7-zip \
 	tar && \
  echo "**** install heimdall ****" && \
  mkdir -p \