diff --git a/docker/dev/Dockerfile b/docker/dev/Dockerfile
index 3a567a11..181428a3 100644
--- a/docker/dev/Dockerfile
+++ b/docker/dev/Dockerfile
@@ -18,7 +18,7 @@ RUN curl -O https://noto-website.storage.googleapis.com/pkgs/NotoSansCJKjp-hinte
 # add go bin to path.
 ENV PATH "$PATH:/root/go/bin"
 
-echo $PATH
+RUN echo $PATH
 
 # project directory.
 WORKDIR /usr/src/diagrams
diff --git a/docker/dev/Dockerfile2 b/docker/dev/Dockerfile2
index f8a9cdc6..d456cb51 100644
--- a/docker/dev/Dockerfile2
+++ b/docker/dev/Dockerfile2
@@ -10,7 +10,7 @@ WORKDIR /usr/src/diagrams
 
 RUN python -m unittest tests/*.py -v
 
-echo $PATH
+RUN echo $PATH
 
 RUN ./autogen.sh