diff --git a/src/OpenApiLibCore/openapi_libcore.py b/src/OpenApiLibCore/openapi_libcore.py
index ae835a4..863c047 100644
--- a/src/OpenApiLibCore/openapi_libcore.py
+++ b/src/OpenApiLibCore/openapi_libcore.py
@@ -658,7 +658,8 @@ def _get_json_types(self, item: Any) -> Generator[str, None, None]:
             else:
                 for content_type in content_dict:
                     if "json" in content_type:
-                        yield content_type
+                        content_type_without_charset, _, _ = content_type.partition(";")
+                        yield content_type_without_charset
 
         if isinstance(item, list):
             for list_item in item: