diff --git a/rc/filetype/haskell.kak b/rc/filetype/haskell.kak
index 82fba2c9..7745384c 100644
--- a/rc/filetype/haskell.kak
+++ b/rc/filetype/haskell.kak
@@ -87,8 +87,7 @@ add-highlighter shared/haskell/code/ regex \B'([^\\]|[\\]['"\w\d\\])' 0:string
 # this has to come after operators so '-' etc is correct
 
 # matches function names in type signatures
-add-highlighter shared/haskell/code/ regex ^\h*(?:(?:where|let|default)\h+)?([_a-z]['\w]*)\s+::\s 1:meta
-
+add-highlighter shared/haskell/code/ regex ^\s*(?:where\s+|let\s+|default\s+)?([_a-z]['\w]*#?(?:,\s*[_a-z]['\w]*#?)*)\s+::\s 1:meta
 
 # matches deriving strategies
 add-highlighter shared/haskell/code/ regex \bderiving\s+\b(stock|newtype|anyclass|via)\b 1:keyword