diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 54860dc278e..9b6f4626586 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2018-01-10  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/81055
+	* init.c (build_vec_init): Avoid building an INIT_EXPR with
+	error_mark_node as second argument.
+
 2018-01-09  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/83734
diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index 6c820e5689e..1be7c67d867 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -4399,7 +4399,9 @@ build_vec_init (tree base, tree maxindex, tree init,
 	      if (TREE_CODE (init) == TREE_LIST)
 		init = build_x_compound_expr_from_list (init, ELK_INIT,
 							complain);
-	      elt_init = build2 (INIT_EXPR, type, to, init);
+	      elt_init = (init == error_mark_node
+			  ? error_mark_node
+			  : build2 (INIT_EXPR, type, to, init));
 	    }
 	}
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a46a5ee6722..dca24d8f28b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-01-10  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/81055
+	* g++.dg/cpp0x/new2.C: New.
+
 2018-01-10  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/83735
diff --git a/gcc/testsuite/g++.dg/cpp0x/new2.C b/gcc/testsuite/g++.dg/cpp0x/new2.C
new file mode 100644
index 00000000000..f0bbc8092cd
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/new2.C
@@ -0,0 +1,4 @@
+// PR c++/81055
+// { dg-do compile { target c++11 } }
+
+int** p = new int*[1]{q};  // { dg-error "not declared" }