diff --git a/plugins/gem/_gem b/plugins/gem/_gem
index 975cec602..e6b903c24 100644
--- a/plugins/gem/_gem
+++ b/plugins/gem/_gem
@@ -55,6 +55,9 @@ if (( CURRENT == 1 )); then
 fi
 
 case "$words[1]" in
+  build)
+    _files -g "*.gemspec"
+    ;;
   list)
       if [[ "$state" == forms ]]; then
         _gem_installed