diff --git a/packer/Dockerfile-full b/packer/Dockerfile-full
index 15294b3..58d64c5 100644
--- a/packer/Dockerfile-full
+++ b/packer/Dockerfile-full
@@ -12,4 +12,4 @@ WORKDIR $GOPATH/src/github.com/hashicorp/packer
 RUN /bin/bash scripts/build.sh
 
 WORKDIR $GOPATH
-ENTRYPOINT ["bin/packer"]
+CMD ["bin/packer"]
diff --git a/packer/Dockerfile-light b/packer/Dockerfile-light
index 091a6c4..fdb2d11 100644
--- a/packer/Dockerfile-light
+++ b/packer/Dockerfile-light
@@ -14,4 +14,4 @@ RUN sha256sum -cs packer_${PACKER_VERSION}_SHA256SUMS
 RUN unzip packer_${PACKER_VERSION}_linux_amd64.zip -d /bin
 RUN rm -f packer_${PACKER_VERSION}_linux_amd64.zip
 
-ENTRYPOINT ["/bin/packer"]
+CMD ["/bin/packer"]