diff --git a/lib-injection/host_inject.rb b/lib-injection/host_inject.rb
new file mode 100644
index 0000000000..eaca133a90
--- /dev/null
+++ b/lib-injection/host_inject.rb
@@ -0,0 +1,7 @@
+# This file's intent is to be parseable and executable by all ruby versions
+# to call into the main one only for versions for which it is known-compatible
+# with at the language level.
+
+if RUBY_VERSION >= '2.5.'
+  require File.expand_path(File.join(File.dirname(__FILE__), 'host_inject_main.rb'))
+end