diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 60211d8add0..b419f648a27 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,11 @@
+2012-12-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/55542
+	* pt.c (make_ith_pack_parameter_name): Return NULL if
+	name is NULL.
+	(tsubst_decl): Call make_ith_pack_parameter_name even if
+	DECL_NAME is NULL.
+
 2012-11-29  Jason Merrill  <jason@redhat.com>
 
 	PR c++/53137
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 3bc0d64d6ba..e349be6c4ab 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -2905,6 +2905,8 @@ make_ith_pack_parameter_name (tree name, int i)
   char* newname;
   int newname_len;
 
+  if (name == NULL_TREE)
+    return name;
   snprintf (numbuf, NUMBUF_LEN, "%i", i);
   newname_len = IDENTIFIER_LENGTH (name)
 	        + strlen (numbuf) + 2;
@@ -10261,10 +10263,9 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
                 /* Get the Ith type.  */
                 type = TREE_VEC_ELT (expanded_types, i);
 
-                if (DECL_NAME (r))
-                  /* Rename the parameter to include the index.  */
-                  DECL_NAME (r) =
-                    make_ith_pack_parameter_name (DECL_NAME (r), i);
+		/* Rename the parameter to include the index.  */
+		DECL_NAME (r)
+		  = make_ith_pack_parameter_name (DECL_NAME (r), i);
               }
             else if (!type)
               /* We're dealing with a normal parameter.  */
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 573e3906357..a5e29e28d6b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2012-12-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/55542
+	* g++.dg/cpp0x/vt-55542.C: New test.
+
 2012-11-30  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/specs/pack9.ads: New test.
diff --git a/gcc/testsuite/g++.dg/cpp0x/vt-55542.C b/gcc/testsuite/g++.dg/cpp0x/vt-55542.C
new file mode 100644
index 00000000000..3d5efee87d9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/vt-55542.C
@@ -0,0 +1,22 @@
+// PR c++/55542
+// { dg-options "-std=c++11" }
+
+template <typename ... P>
+struct B
+{
+  template <typename O>
+  B (O *o, void (O::*f) (P ... p)) {}
+};
+class C
+{
+  void foo (void *, int);
+  template <typename ... A>
+  void bar (A ... a);
+  B <void *> c;
+  B <void *, int> d;
+  C (int) : c (this, &C::bar), d (this, &C::foo) {}
+};
+template <typename ... A>
+void C::bar (A ...)
+{
+}