diff --git a/Dockerfile b/Dockerfile
index 566c9bb72..dc46019c3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -43,8 +43,9 @@ RUN venv/bin/pip freeze
 # Check python dependencies for the GPL
 # Due to the following bug, pip results must be piped to a file before grepping:
 # https://github.com/pypa/pip/pull/3304
-RUN cat requirements.txt | grep -v "^-e" | awk -F'==' '{print $1}' | xargs venv/bin/pip --disable-pip-version-check show > pipinfo.txt
-RUN test -z $(cat pipinfo.txt | grep GPL | grep -v LGPL)
+RUN cat requirements.txt | grep -v "^-e" | awk -F'==' '{print $1}' | xargs venv/bin/pip --disable-pip-version-check show > pipinfo.txt &&
+    test -z $(cat pipinfo.txt | grep GPL | grep -v LGPL) &&
+    rm pipinfo.txt
 
 # Install the binary dependencies
 ADD binary_dependencies binary_dependencies