diff --git a/samples/monster_generated.h b/samples/monster_generated.h
index 574026501..74cb96253 100644
--- a/samples/monster_generated.h
+++ b/samples/monster_generated.h
@@ -390,7 +390,7 @@ struct MonsterBuilder {
 
 inline flatbuffers::Offset<Monster> CreateMonster(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Sample::Vec3 *pos = 0,
+    const MyGame::Sample::Vec3 *pos = nullptr,
     int16_t mana = 150,
     int16_t hp = 100,
     flatbuffers::Offset<flatbuffers::String> name = 0,
@@ -416,7 +416,7 @@ inline flatbuffers::Offset<Monster> CreateMonster(
 
 inline flatbuffers::Offset<Monster> CreateMonsterDirect(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Sample::Vec3 *pos = 0,
+    const MyGame::Sample::Vec3 *pos = nullptr,
     int16_t mana = 150,
     int16_t hp = 100,
     const char *name = nullptr,
diff --git a/src/idl_gen_cpp.cpp b/src/idl_gen_cpp.cpp
index 457223979..019845db4 100644
--- a/src/idl_gen_cpp.cpp
+++ b/src/idl_gen_cpp.cpp
@@ -1683,6 +1683,8 @@ class CppGenerator : public BaseGenerator {
       } else {
         return "0";
       }
+    } else if (IsStruct(type) && (field.value.constant == "0")) {
+      return "nullptr";
     } else {
       return GenDefaultConstant(field);
     }
diff --git a/tests/arrays_test_generated.h b/tests/arrays_test_generated.h
index e2163ee64..1606b99b4 100644
--- a/tests/arrays_test_generated.h
+++ b/tests/arrays_test_generated.h
@@ -312,7 +312,7 @@ struct ArrayTableBuilder {
 
 inline flatbuffers::Offset<ArrayTable> CreateArrayTable(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Example::ArrayStruct *a = 0) {
+    const MyGame::Example::ArrayStruct *a = nullptr) {
   ArrayTableBuilder builder_(_fbb);
   builder_.add_a(a);
   return builder_.Finish();
diff --git a/tests/cpp17/generated_cpp17/monster_test_generated.h b/tests/cpp17/generated_cpp17/monster_test_generated.h
index 36a46cf54..06477eab3 100644
--- a/tests/cpp17/generated_cpp17/monster_test_generated.h
+++ b/tests/cpp17/generated_cpp17/monster_test_generated.h
@@ -1947,7 +1947,7 @@ struct MonsterBuilder {
 
 inline flatbuffers::Offset<Monster> CreateMonster(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Example::Vec3 *pos = 0,
+    const MyGame::Example::Vec3 *pos = nullptr,
     int16_t mana = 150,
     int16_t hp = 100,
     flatbuffers::Offset<flatbuffers::String> name = 0,
@@ -2115,7 +2115,7 @@ struct Monster::Traits {
 
 inline flatbuffers::Offset<Monster> CreateMonsterDirect(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Example::Vec3 *pos = 0,
+    const MyGame::Example::Vec3 *pos = nullptr,
     int16_t mana = 150,
     int16_t hp = 100,
     const char *name = nullptr,
diff --git a/tests/evolution_test/evolution_v1_generated.h b/tests/evolution_test/evolution_v1_generated.h
index 4fd5f50df..bcde2c6b1 100644
--- a/tests/evolution_test/evolution_v1_generated.h
+++ b/tests/evolution_test/evolution_v1_generated.h
@@ -394,7 +394,7 @@ inline flatbuffers::Offset<Root> CreateRoot(
     flatbuffers::Offset<void> c = 0,
     Evolution::V1::Enum d = Evolution::V1::Enum::King,
     flatbuffers::Offset<Evolution::V1::TableA> e = 0,
-    const Evolution::V1::Struct *f = 0,
+    const Evolution::V1::Struct *f = nullptr,
     flatbuffers::Offset<flatbuffers::Vector<int32_t>> g = 0,
     flatbuffers::Offset<flatbuffers::Vector<flatbuffers::Offset<Evolution::V1::TableB>>> h = 0,
     int32_t i = 1234,
@@ -424,7 +424,7 @@ inline flatbuffers::Offset<Root> CreateRootDirect(
     flatbuffers::Offset<void> c = 0,
     Evolution::V1::Enum d = Evolution::V1::Enum::King,
     flatbuffers::Offset<Evolution::V1::TableA> e = 0,
-    const Evolution::V1::Struct *f = 0,
+    const Evolution::V1::Struct *f = nullptr,
     const std::vector<int32_t> *g = nullptr,
     const std::vector<flatbuffers::Offset<Evolution::V1::TableB>> *h = nullptr,
     int32_t i = 1234,
diff --git a/tests/evolution_test/evolution_v2_generated.h b/tests/evolution_test/evolution_v2_generated.h
index 940b35e98..c56c780b8 100644
--- a/tests/evolution_test/evolution_v2_generated.h
+++ b/tests/evolution_test/evolution_v2_generated.h
@@ -480,7 +480,7 @@ inline flatbuffers::Offset<Root> CreateRoot(
     flatbuffers::Offset<void> c = 0,
     Evolution::V2::Enum d = Evolution::V2::Enum::King,
     flatbuffers::Offset<Evolution::V2::TableA> e = 0,
-    const Evolution::V2::Struct *ff = 0,
+    const Evolution::V2::Struct *ff = nullptr,
     flatbuffers::Offset<flatbuffers::Vector<int32_t>> g = 0,
     flatbuffers::Offset<flatbuffers::Vector<flatbuffers::Offset<Evolution::V2::TableB>>> h = 0,
     uint32_t i = 1234,
@@ -508,7 +508,7 @@ inline flatbuffers::Offset<Root> CreateRootDirect(
     flatbuffers::Offset<void> c = 0,
     Evolution::V2::Enum d = Evolution::V2::Enum::King,
     flatbuffers::Offset<Evolution::V2::TableA> e = 0,
-    const Evolution::V2::Struct *ff = 0,
+    const Evolution::V2::Struct *ff = nullptr,
     const std::vector<int32_t> *g = nullptr,
     const std::vector<flatbuffers::Offset<Evolution::V2::TableB>> *h = nullptr,
     uint32_t i = 1234,
diff --git a/tests/monster_test_generated.h b/tests/monster_test_generated.h
index ce4ec2412..1a887aabc 100644
--- a/tests/monster_test_generated.h
+++ b/tests/monster_test_generated.h
@@ -1887,7 +1887,7 @@ struct MonsterBuilder {
 
 inline flatbuffers::Offset<Monster> CreateMonster(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Example::Vec3 *pos = 0,
+    const MyGame::Example::Vec3 *pos = nullptr,
     int16_t mana = 150,
     int16_t hp = 100,
     flatbuffers::Offset<flatbuffers::String> name = 0,
@@ -1993,7 +1993,7 @@ inline flatbuffers::Offset<Monster> CreateMonster(
 
 inline flatbuffers::Offset<Monster> CreateMonsterDirect(
     flatbuffers::FlatBufferBuilder &_fbb,
-    const MyGame::Example::Vec3 *pos = 0,
+    const MyGame::Example::Vec3 *pos = nullptr,
     int16_t mana = 150,
     int16_t hp = 100,
     const char *name = nullptr,
diff --git a/tests/namespace_test/namespace_test2_generated.h b/tests/namespace_test/namespace_test2_generated.h
index d6a2f4972..b53bc1517 100644
--- a/tests/namespace_test/namespace_test2_generated.h
+++ b/tests/namespace_test/namespace_test2_generated.h
@@ -171,7 +171,7 @@ inline flatbuffers::Offset<TableInFirstNS> CreateTableInFirstNS(
     NamespaceA::NamespaceB::EnumInNestedNS foo_enum = NamespaceA::NamespaceB::EnumInNestedNS_A,
     NamespaceA::NamespaceB::UnionInNestedNS foo_union_type = NamespaceA::NamespaceB::UnionInNestedNS_NONE,
     flatbuffers::Offset<void> foo_union = 0,
-    const NamespaceA::NamespaceB::StructInNestedNS *foo_struct = 0) {
+    const NamespaceA::NamespaceB::StructInNestedNS *foo_struct = nullptr) {
   TableInFirstNSBuilder builder_(_fbb);
   builder_.add_foo_struct(foo_struct);
   builder_.add_foo_union(foo_union);