diff --git a/main.go b/main.go
index <HASH>..<HASH> 100644
--- a/main.go
+++ b/main.go
@@ -168,7 +168,7 @@ var (
 	debugFlag         = kingpin.Flag("debug", "Display messages for failed linters, etc.").Short('d').Bool()
 	concurrencyFlag   = kingpin.Flag("concurrency", "Number of concurrent linters to run.").Default("16").Short('j').Int()
 	excludeFlag       = kingpin.Flag("exclude", "Exclude messages matching these regular expressions.").Short('e').PlaceHolder("REGEXP").Strings()
-	includeFlag       = kingpin.Flag("include", "Include messages matching these regular expressions.").Short('i').PlaceHolder("REGEXP").Strings()
+	includeFlag       = kingpin.Flag("include", "Include messages matching these regular expressions.").Short('I').PlaceHolder("REGEXP").Strings()
 	skipFlag          = kingpin.Flag("skip", "Skip directories with this name when expanding '...'.").Short('s').PlaceHolder("DIR...").Strings()
 	vendorFlag        = kingpin.Flag("vendor", "Enable vendoring support (skips 'vendor' directories and sets GO15VENDOREXPERIMENT=1).").Bool()
 	cycloFlag         = kingpin.Flag("cyclo-over", "Report functions with cyclomatic complexity over N (using gocyclo).").Default("10").Int()
Change --include short flag to -I.

This was conflicting with -i for install. Also fixed upstream omission
in Kingpin where duplicate flags were not detected.

Fixes #<I>.