diff --git a/dev-python/citeproc-py/citeproc-py-0.4.0-r1.ebuild b/dev-python/citeproc-py/citeproc-py-0.4.0-r1.ebuild
index 5673440953933..0077a97d05474 100644
--- a/dev-python/citeproc-py/citeproc-py-0.4.0-r1.ebuild
+++ b/dev-python/citeproc-py/citeproc-py-0.4.0-r1.ebuild
@@ -3,7 +3,8 @@
 
 EAPI=7
 
-PYTHON_COMPAT=( python3_{6,7} )
+PYTHON_COMPAT=( python3_{6..9} )
+
 inherit distutils-r1
 
 DESCRIPTION="Yet another Python CSL Processor"