diff --git a/Dockerfile b/Dockerfile
index 8603df1..059640b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,14 +17,14 @@ RUN set -x && \
     #
     # These are needed to compile and install the mlat_client:
     KEPT_PACKAGES+=(python3) && \
+    KEPT_PACKAGES+=(python3-pkg-resources) && \
     TEMP_PACKAGES+=(build-essential) && \
     TEMP_PACKAGES+=(debhelper) && \
-    KEPT_PACKAGES+=(python3-dev) && \
-    KEPT_PACKAGES+=(python3-distutils-extra) && \
-    KEPT_PACKAGES+=(python3-pip) && \
-    KEPT_PACKAGES+=(python3-setuptools) && \
-    KEPT_PACKAGES+=(python3-pkg-resources) && \
-    KEPT_PACKAGES+=(python3-wheel) && \
+    TEMP_PACKAGES+=(python3-dev) && \
+    TEMP_PACKAGES+=(python3-distutils-extra) && \
+    TEMP_PACKAGES+=(python3-pip) && \
+    TEMP_PACKAGES+=(python3-setuptools) && \
+    TEMP_PACKAGES+=(python3-wheel) && \
     #
     # packages needed for debugging - these can stay out in production builds:
     #KEPT_PACKAGES+=(procps nano aptitude psmisc) && \