diff --git a/bin/rbenv-install b/bin/rbenv-install
index 3dca6489dc..dd384617f5 100755
--- a/bin/rbenv-install
+++ b/bin/rbenv-install
@@ -2,6 +2,11 @@
 set -e
 [ -n "$RBENV_DEBUG" ] && set -x
 
+# Provide rbenv completions
+if [ "$1" = "--complete" ]; then
+  exec ruby-build --definitions
+fi
+
 if [ -z "$RBENV_ROOT" ]; then
   RBENV_ROOT="${HOME}/.rbenv"
 fi