diff --git a/src/ifcopenshell-python/Makefile b/src/ifcopenshell-python/Makefile
index 6e99b5d6d9..1802d2d342 100644
--- a/src/ifcopenshell-python/Makefile
+++ b/src/ifcopenshell-python/Makefile
@@ -1,3 +1,4 @@
+SHELL := sh
 IS_STABLE:=FALSE
 VERSION:=$(shell cat ../../VERSION)
 VERSION_DATE:=$(shell date '+%y%m%d')