diff --git a/docs/source/conf.py b/docs/source/conf.py
index 4223ddc379..01f975ea71 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -69,6 +69,12 @@ html_context = {'version': 'V3.1'}
 # Properties.
 kotlin_version = '1.2.51'
 
+rst_epilog = """
+.. |kotlin_version| replace:: {kotlin_version}
+""".format(
+    kotlin_version = kotlin_version,
+)
+
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #