diff --git a/src/NJsonSchema.CodeGeneration.CSharp.Tests/DefaultPropertyTests.cs b/src/NJsonSchema.CodeGeneration.CSharp.Tests/DefaultPropertyTests.cs
index 3368ed239..d1eb0b828 100644
--- a/src/NJsonSchema.CodeGeneration.CSharp.Tests/DefaultPropertyTests.cs
+++ b/src/NJsonSchema.CodeGeneration.CSharp.Tests/DefaultPropertyTests.cs
@@ -127,5 +127,69 @@ public async Task When_generating_CSharp_code_then_default_value_with_decimal_ge
             Assert.DoesNotContain("SomeOptionalProperty { get; set; } = D;", code);
             Assert.Contains("double SomeOptionalProperty { get; set; } = 123.456D;", code);
         }
+        
+        [Fact]
+        public async Task When_generating_CSharp_code_then_default_value_of_dictionary_with_array_values_generates_expected_expression()
+        {
+            // Arrange
+            var document = await JsonSchema.FromJsonAsync(@"{
+              ""type"": ""object"",
+              ""required"": [""requiredDictionary""],
+              ""properties"": {
+                ""requiredDictionary"": {
+                  ""type"": ""object"",
+                  ""additionalProperties"": {
+                    ""type"": ""array"",
+                    ""items"": {
+                      ""type"": ""string""                
+                    }
+                  }
+                }
+              }
+            }");
+
+            // Act
+            var settings = new CSharpGeneratorSettings();
+            settings.GenerateDefaultValues = true;
+
+            var generator = new CSharpGenerator(document, settings);
+            var code = generator.GenerateFile();
+
+            // Assert
+            Assert.DoesNotContain("System.Collections.Generic.IDictionary<string, System.Collections.Generic.ICollection<string>> RequiredDictionary { get; set; } = new System.Collections.Generic.Dictionary<string, System.Collections.ObjectModel.Collection<string>>();", code);
+            Assert.Contains("System.Collections.Generic.IDictionary<string, System.Collections.Generic.ICollection<string>> RequiredDictionary { get; set; } = new System.Collections.Generic.Dictionary<string, System.Collections.Generic.ICollection<string>>();", code);
+        }
+
+        [Fact]
+        public async Task When_generating_CSharp_code_then_default_value_of_array_of_arrays_generates_expected_expression()
+        {
+            // Arrange
+            var document = await JsonSchema.FromJsonAsync(@"{
+              ""type"": ""object"",
+              ""required"": [""requiredList""],
+              ""properties"": {
+                ""requiredList"": {
+                  ""type"": ""array"",
+                  ""items"": {
+                    ""type"": ""array"",
+                    ""items"": {
+                      ""type"": ""string""                
+                    }
+                  }
+                }
+              }
+            }");
+
+            // Act
+            var settings = new CSharpGeneratorSettings();
+            settings.GenerateDefaultValues = true;
+
+            var generator = new CSharpGenerator(document, settings);
+            var code = generator.GenerateFile();
+
+            // Assert
+            Assert.DoesNotContain("System.Collections.Generic.ICollection<System.Collections.Generic.ICollection<string>> RequiredList { get; set; } = new System.Collections.ObjectModel.Collection<System.Collections.ObjectModel.Collection<string>>();", code);
+            Assert.Contains("System.Collections.Generic.ICollection<System.Collections.Generic.ICollection<string>> RequiredList { get; set; } = new System.Collections.ObjectModel.Collection<System.Collections.Generic.ICollection<string>>();", code);
+        }
     }
 }
diff --git a/src/NJsonSchema.CodeGeneration.CSharp/CSharpValueGenerator.cs b/src/NJsonSchema.CodeGeneration.CSharp/CSharpValueGenerator.cs
index bfd3df3b0..ae4dc542d 100644
--- a/src/NJsonSchema.CodeGeneration.CSharp/CSharpValueGenerator.cs
+++ b/src/NJsonSchema.CodeGeneration.CSharp/CSharpValueGenerator.cs
@@ -66,12 +66,12 @@ public override string GetDefaultValue(JsonSchema schema, bool allowsNull, strin
                     if (schema.Type.IsArray() ||
                         schema.Type.IsObject())
                     {
-                        targetType = !string.IsNullOrEmpty(_settings.DictionaryInstanceType)
-                            ? targetType.Replace(_settings.DictionaryType + "<", _settings.DictionaryInstanceType + "<")
+                        targetType = !string.IsNullOrEmpty(_settings.DictionaryInstanceType) && targetType.StartsWith(_settings.DictionaryType + "<")
+                            ? _settings.DictionaryInstanceType + targetType.Substring(_settings.DictionaryType.Length)
                             : targetType;
 
-                        targetType = !string.IsNullOrEmpty(_settings.ArrayInstanceType)
-                            ? targetType.Replace(_settings.ArrayType + "<", _settings.ArrayInstanceType + "<")
+                        targetType = !string.IsNullOrEmpty(_settings.ArrayInstanceType) && targetType.StartsWith(_settings.ArrayType + "<")
+                            ? _settings.ArrayInstanceType + targetType.Substring(_settings.ArrayType.Length)
                             : targetType;
 
                         return $"new {targetType}()";