diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 54636bd75b86..72eaec1cda00 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -4373,19 +4373,16 @@ public CodegenParameter fromRequestBody(RequestBody body, Map<String, Schema> sc
                 if (schema.getAdditionalProperties() != null) {// http body is map
                     LOGGER.error("Map should be supported. Please report to openapi-generator github repo about the issue.");
                 } else if (codegenProperty != null) {
-                    LOGGER.warn("The following schema has undefined (null) baseType. " +
-                            "It could be due to form parameter defined in OpenAPI v2 spec with incorrect consumes. " +
-                            "A correct 'consumes' for form parameters should be " +
-                            "'application/x-www-form-urlencoded' or 'multipart/form-data'");
-                    LOGGER.warn("schema: " + schema);
-                    LOGGER.warn("Defaulting baseType to UNKNOWN_BASE_TYPE");
-                    codegenProperty.baseType = "UNKNOWN_BASE_TYPE";
-
-                    codegenParameter.baseName = codegenProperty.baseType;
-                    codegenParameter.baseType = codegenProperty.baseType;
-                    codegenParameter.dataType = codegenProperty.dataType;
-                    codegenParameter.description = codegenProperty.description;
-                    codegenParameter.paramName = toParamName(codegenProperty.baseType);
+                    if (StringUtils.isEmpty(bodyParameterName)) {
+                        codegenParameter.baseName = codegenModel.classname;
+                    } else {
+                        codegenParameter.baseName = bodyParameterName;
+                    }
+                    codegenParameter.paramName = toParamName(codegenParameter.baseName);
+                    codegenParameter.baseType = codegenModel.classname;
+                    codegenParameter.dataType = getTypeDeclaration(codegenModel.classname);
+                    codegenParameter.description = codegenModel.description;
+                    imports.add(codegenParameter.baseType);
 
                     if (codegenProperty.complexType != null) {
                         imports.add(codegenProperty.complexType);