diff --git a/srcpkgs/rapidjson/patches/0002-gcc81-copy-assignment.patch b/srcpkgs/rapidjson/patches/0002-gcc81-copy-assignment.patch
new file mode 100644
index 00000000000..c4ddd8a0a3c
--- /dev/null
+++ b/srcpkgs/rapidjson/patches/0002-gcc81-copy-assignment.patch
@@ -0,0 +1,20 @@
+--- include/rapidjson/document.h	2016-08-25 09:59:05.000000000 +0200
++++ include/rapidjson/document.h	2018-05-30 09:55:35.028135241 +0200
+@@ -1936,7 +1936,7 @@
+         if (count) {
+             GenericValue* e = static_cast<GenericValue*>(allocator.Malloc(count * sizeof(GenericValue)));
+             SetElementsPointer(e);
+-            std::memcpy(e, values, count * sizeof(GenericValue));
++            *e = *values;
+         }
+         else
+             SetElementsPointer(0);
+@@ -1949,7 +1949,7 @@
+         if (count) {
+             Member* m = static_cast<Member*>(allocator.Malloc(count * sizeof(Member)));
+             SetMembersPointer(m);
+-            std::memcpy(m, members, count * sizeof(Member));
++            *m = *members;
+         }
+         else
+             SetMembersPointer(0);