diff --git a/lib/MetaCPAN/Types/TypeTiny.pm b/lib/MetaCPAN/Types/TypeTiny.pm
index d63ac5808..deea5f7a4 100644
--- a/lib/MetaCPAN/Types/TypeTiny.pm
+++ b/lib/MetaCPAN/Types/TypeTiny.pm
@@ -132,5 +132,8 @@ declare CommaSepOption, as ArrayRef [ StrMatch [qr{^[^, ]+$}] ];
 coerce CommaSepOption, from ArrayRef [Str], via {
     return [ map split(/\s*,\s*/), @$_ ];
 };
+coerce CommaSepOption, from Str, via {
+    return [ map split(/\s*,\s*/), $_ ];
+};
 
 1;