diff --git a/pkl-formatter/src/test/files/FormatterSnippetTests/input/comma-termination.pkl b/pkl-formatter/src/test/files/FormatterSnippetTests/input/comma-termination.pkl
index 6a110348..e96ad099 100644
--- a/pkl-formatter/src/test/files/FormatterSnippetTests/input/comma-termination.pkl
+++ b/pkl-formatter/src/test/files/FormatterSnippetTests/input/comma-termination.pkl
@@ -15,4 +15,4 @@ trailingCommaInConstraints: String(isSomethingSomethingSomething, isSomethingEls
 
 trailingCommaInTypeParameters: Mapping<SomethingSomethingSomethingSomething, SomethingSomething | SomethingElse>
 
-functionType: (ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType, ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType2,) -> String
+functionType: (ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType, ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType2, /* comment */) -> String
diff --git a/pkl-formatter/src/test/files/FormatterSnippetTests/output/comma-termination.pkl b/pkl-formatter/src/test/files/FormatterSnippetTests/output/comma-termination.pkl
index 269a5923..169971a3 100644
--- a/pkl-formatter/src/test/files/FormatterSnippetTests/output/comma-termination.pkl
+++ b/pkl-formatter/src/test/files/FormatterSnippetTests/output/comma-termination.pkl
@@ -36,6 +36,6 @@ trailingCommaInTypeParameters: Mapping<
 
 functionType: (
   ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType,
-  ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType2,
+  ReaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaalyLongType2 /* comment */,
 ) ->
   String
diff --git a/pkl-parser/src/main/java/org/pkl/parser/GenericParser.java b/pkl-parser/src/main/java/org/pkl/parser/GenericParser.java
index 4738b9c3..c8457cda 100644
--- a/pkl-parser/src/main/java/org/pkl/parser/GenericParser.java
+++ b/pkl-parser/src/main/java/org/pkl/parser/GenericParser.java
@@ -1170,7 +1170,8 @@ public class GenericParser {
               ff(elements);
               while (lookahead == Token.COMMA) {
                 var comma = next();
-                if (lookahead == Token.RPAREN) {
+                if (lookahead() == Token.RPAREN) {
+                  ff(elements);
                   break;
                 }
                 elements.add(makeTerminal(comma));