diff --git a/documentation/Makefile b/documentation/Makefile
index 3c4aed409..3f9d7de7a 100644
--- a/documentation/Makefile
+++ b/documentation/Makefile
@@ -42,8 +42,8 @@ BKR_PATH_INJECTED = $(bkr_path_injected)
 
 # You can set these variables from the command line.
 SPHINXOPTS    =
-SPHINXBUILD  := $(python_command) -c '__requires__ = [$(SPHINXREQUIRES)]; import pkg_resources; \
-    import bkr; bkr.__path__ = [$(BKR_PATH_INJECTED)]; \
+SPHINXBUILD  := $(python_command) -V; $(python_command) -m pip freeze; $(python_command) -c '__requires__ = [$(SPHINXREQUIRES)]; import pkg_resources; \
+    import six; import bkr; bkr.__path__ = [$(BKR_PATH_INJECTED)]; \
     exec(open("$(SPHINXBUILD)").read())'
 PAPER         =
 BUILDDIR      = _build