diff --git a/generate-flag-types b/generate-flag-types
index 8567f5d..47a168b 100755
--- a/generate-flag-types
+++ b/generate-flag-types
@@ -202,6 +202,10 @@ def _write_altsrc_flag_types(outfile, types):
     _fwrite(outfile, """\
         package altsrc
 
+        import (
+            "gopkg.in/urfave/cli.v1"
+        )
+
         // WARNING: This file is generated!
 
         """)