diff --git a/make/py-defs.mk b/make/py-defs.mk
index 220d1d3d..3568b6c8 100644
--- a/make/py-defs.mk
+++ b/make/py-defs.mk
@@ -26,8 +26,8 @@ else
   PY_PYC                     = $(patsubst %.py,__pycache__/%.cpython-37.pyc,$(PY_ALL_PY))
 endif
 
-PY_INSTALL_PKG_MOD          ?= $(shell $(PWD) | sed 's%.*/python/%%; s%/.*%%')
-PY_INSTALL_SUB_MOD          ?= $(shell $(PWD) | sed "s%.*/$(PY_INSTALL_PKG_MOD)\(/\|$$\)%%")
+PY_INSTALL_PKG_MOD          ?= $(shell $(ECHO) $(CWD) | $(SED) 's%.*/python/%%; s%/.*%%')
+PY_INSTALL_SUB_MOD          ?= $(shell $(ECHO) $(CWD) | $(SED) "s%.*/$(PY_INSTALL_PKG_MOD)\(/\|$$\)%%")
 ifneq ($(PY_INSTALL_SUB_MOD),)
   PY_INSTALL_MOD            ?= $(PY_INSTALL_PKG_MOD)/$(PY_INSTALL_SUB_MOD)
 else