diff --git a/generator/konfig-generator-api/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/generator/konfig-generator-api/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index ca630a1c7..6e2e0ea84 100644
--- a/generator/konfig-generator-api/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/generator/konfig-generator-api/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -4773,6 +4773,9 @@ public CodegenOperation fromOperation(String path,
             }
         }
 
+        if (bodyParam != null && bodyParam.dataType != null)
+            bodyParam.modelFilename = toModelFilename(bodyParam.dataType);
+
         op.hasOneRequiredParamIncludingRequestBodyProperties = requiredParamsWithRequestBodyProperties.size() == 1;
 
         // add imports to operation import tag