diff --git a/clang-tools-extra/pseudo/lib/cxx.bnf b/clang-tools-extra/pseudo/lib/cxx.bnf
--- a/clang-tools-extra/pseudo/lib/cxx.bnf
+++ b/clang-tools-extra/pseudo/lib/cxx.bnf
@@ -409,7 +409,7 @@
 noptr-declarator := noptr-declarator parameters-and-qualifiers
 noptr-declarator := noptr-declarator [ constant-expression_opt ]
 noptr-declarator := ( ptr-declarator )
-parameters-and-qualifiers := ( parameter-declaration-list_opt ) cv-qualifier-seq_opt ref-qualifier_opt noexcept-specifier_opt
+parameters-and-qualifiers := ( parameter-declaration-clause_opt ) cv-qualifier-seq_opt ref-qualifier_opt noexcept-specifier_opt
 trailing-return-type := -> type-id
 ptr-operator := * cv-qualifier-seq_opt
 ptr-operator := &
diff --git a/clang-tools-extra/pseudo/test/glr.cpp b/clang-tools-extra/pseudo/test/glr.cpp
--- a/clang-tools-extra/pseudo/test/glr.cpp
+++ b/clang-tools-extra/pseudo/test/glr.cpp
@@ -33,3 +33,17 @@
 // CHECK-NEXT: │   ├─(
 // CHECK-NEXT: │   └─)
 // CHECK-NEXT: └─;
+
+void foo2(int, ...);
+// CHECK:      declaration~simple-declaration := decl-specifier-seq init-declarator-list ;
+// CHECK-NEXT: ├─decl-specifier-seq~VOID :=
+// CHECK-NEXT: ├─init-declarator-list~noptr-declarator := noptr-declarator parameters-and-qualifiers
+// CHECK-NEXT: │ ├─noptr-declarator~IDENTIFIER :=
+// CHECK-NEXT: │ └─parameters-and-qualifiers := ( parameter-declaration-clause )
+// CHECK-NEXT: │   ├─( :=
+// CHECK-NEXT: │   ├─parameter-declaration-clause := parameter-declaration-list , ...
+// CHECK-NEXT: │   │ ├─parameter-declaration-list~INT :=
+// CHECK-NEXT: │   │ ├─, :=
+// CHECK-NEXT: │   │ └─... :=
+// CHECK-NEXT: │   └─) :=
+// CHECK-NEXT: └─; :=
\ No newline at end of file