diff --git a/prelude.ld b/prelude.ld
index 77aec1f..48d7f1d 100644
--- a/prelude.ld
+++ b/prelude.ld
@@ -261,7 +261,7 @@ fn map {
 fn filter {
 	"Takes a list and a predicate function, and returns a new list with only the items that produce truthy values when the function is called on them. E.g., `filter ([1, 2, 3, 4], odd?) &=> [1, 3]`. Also works on sets."
 	(p? as :fn) -> filter(p?, _)
-	(p? as :fn, xs as list) -> {
+	(p? as :fn, xs as :list) -> {
 		fn filterer (filtered, x) -> if p? (x)
 			then append (filtered, x)
 			else filtered