diff --git a/src/ceph-detect-init/CMakeLists.txt b/src/ceph-detect-init/CMakeLists.txt
index 066be4150cda5..2b146250af47d 100644
--- a/src/ceph-detect-init/CMakeLists.txt
+++ b/src/ceph-detect-init/CMakeLists.txt
@@ -3,6 +3,7 @@ set(CEPH_DETECT_INIT_VIRTUALENV ${CEPH_BUILD_VIRTUALENV}/ceph-detect-init-virtua
 add_custom_target(ceph-detect-init
   COMMAND
   ${CMAKE_SOURCE_DIR}/src/tools/setup-virtualenv.sh ${CEPH_DETECT_INIT_VIRTUALENV} &&
+  ${CEPH_DETECT_INIT_VIRTUALENV}/bin/pip install six &&
   ${CEPH_DETECT_INIT_VIRTUALENV}/bin/pip install --no-index --use-wheel --find-links=file:${CMAKE_SOURCE_DIR}/src/ceph-detect-init/wheelhouse -e .
   WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/src/ceph-detect-init
   COMMENT "ceph-detect-init is being created")
diff --git a/src/ceph-disk/CMakeLists.txt b/src/ceph-disk/CMakeLists.txt
index 1bce4d416f007..97b10818ff786 100644
--- a/src/ceph-disk/CMakeLists.txt
+++ b/src/ceph-disk/CMakeLists.txt
@@ -3,6 +3,7 @@ set(CEPH_DISK_VIRTUALENV ${CEPH_BUILD_VIRTUALENV}/ceph-disk-virtualenv)
 add_custom_target(ceph-disk
   COMMAND
   ${CMAKE_SOURCE_DIR}/src/tools/setup-virtualenv.sh ${CEPH_DISK_VIRTUALENV} &&
+  ${CEPH_DETECT_INIT_VIRTUALENV}/bin/pip install six &&
   ${CEPH_DISK_VIRTUALENV}/bin/pip install --no-index --use-wheel --find-links=file:${CMAKE_SOURCE_DIR}/src/ceph-disk/wheelhouse -e .
   WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/src/ceph-disk
   COMMENT "ceph-disk is being created")