diff --git a/4.0/slim/Dockerfile b/4.0/slim/Dockerfile
index 6d8344b0..7574c204 100644
--- a/4.0/slim/Dockerfile
+++ b/4.0/slim/Dockerfile
@@ -10,7 +10,7 @@ RUN set -ex \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
   ; do \
-    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
 ENV NPM_CONFIG_LOGLEVEL info
diff --git a/4.0/wheezy/Dockerfile b/4.0/wheezy/Dockerfile
index 33939b3e..c93cbce6 100644
--- a/4.0/wheezy/Dockerfile
+++ b/4.0/wheezy/Dockerfile
@@ -10,7 +10,7 @@ RUN set -ex \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
   ; do \
-    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" \
+    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
 ENV NPM_CONFIG_LOGLEVEL info