diff --git a/src/Swashbuckle.AspNetCore.SwaggerGen/SchemaGenerator/SchemaGenerator.cs b/src/Swashbuckle.AspNetCore.SwaggerGen/SchemaGenerator/SchemaGenerator.cs
index 0c937612..d9349be7 100644
--- a/src/Swashbuckle.AspNetCore.SwaggerGen/SchemaGenerator/SchemaGenerator.cs
+++ b/src/Swashbuckle.AspNetCore.SwaggerGen/SchemaGenerator/SchemaGenerator.cs
@@ -203,6 +203,10 @@ private OpenApiSchema GeneratePolymorphicSchema(
         {
             typeof(IFormFile),
             typeof(FileResult),
+            typeof(System.IO.Stream),
+#if NETCOREAPP3_0_OR_GREATER
+            typeof(System.IO.Pipelines.PipeReader),
+#endif
         };
 
         private OpenApiSchema GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository)
diff --git a/test/Swashbuckle.AspNetCore.Newtonsoft.Test/SchemaGenerator/NewtonsoftSchemaGeneratorTests.cs b/test/Swashbuckle.AspNetCore.Newtonsoft.Test/SchemaGenerator/NewtonsoftSchemaGeneratorTests.cs
index 58b91c44..040380ed 100644
--- a/test/Swashbuckle.AspNetCore.Newtonsoft.Test/SchemaGenerator/NewtonsoftSchemaGeneratorTests.cs
+++ b/test/Swashbuckle.AspNetCore.Newtonsoft.Test/SchemaGenerator/NewtonsoftSchemaGeneratorTests.cs
@@ -23,7 +23,8 @@ public class NewtonsoftSchemaGeneratorTests
         [Theory]
         [InlineData(typeof(IFormFile))]
         [InlineData(typeof(FileResult))]
-        public void GenerateSchema_GeneratesFileSchema_IfFormFileOrFileResultType(Type type)
+        [InlineData(typeof(System.IO.Stream))]
+        public void GenerateSchema_GeneratesFileSchema_BinaryStringResultType(Type type)
         {
             var schema = Subject().GenerateSchema(type, new SchemaRepository());
 
diff --git a/test/Swashbuckle.AspNetCore.SwaggerGen.Test/SchemaGenerator/JsonSerializerSchemaGeneratorTests.cs b/test/Swashbuckle.AspNetCore.SwaggerGen.Test/SchemaGenerator/JsonSerializerSchemaGeneratorTests.cs
index 30da476c..efa3f7ad 100644
--- a/test/Swashbuckle.AspNetCore.SwaggerGen.Test/SchemaGenerator/JsonSerializerSchemaGeneratorTests.cs
+++ b/test/Swashbuckle.AspNetCore.SwaggerGen.Test/SchemaGenerator/JsonSerializerSchemaGeneratorTests.cs
@@ -23,7 +23,9 @@ public class JsonSerializerSchemaGeneratorTests
         [Theory]
         [InlineData(typeof(IFormFile))]
         [InlineData(typeof(FileResult))]
-        public void GenerateSchema_GeneratesFileSchema_IfFormFileOrFileResultType(Type type)
+        [InlineData(typeof(System.IO.Stream))]
+        [InlineData(typeof(System.IO.Pipelines.PipeReader))]
+        public void GenerateSchema_GeneratesFileSchema_BinaryStringResultType(Type type)
         {
             var schema = Subject().GenerateSchema(type, new SchemaRepository());