diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
index 024e0936e2690..0bce6a9a79bc1 100644
--- a/eclass/python-utils-r1.eclass
+++ b/eclass/python-utils-r1.eclass
@@ -40,7 +40,7 @@ inherit toolchain-funcs
 # @INTERNAL
 # @DESCRIPTION:
 # All supported Python implementations, most preferred last.
-_PYTHON_ALL_IMPLS=(
+declare -g -r _PYTHON_ALL_IMPLS=(
 	jython2_5 jython2_7
 	pypy pypy3
 	python3_3 python3_4 python3_5