diff --git a/os/common/utils/oop/include/oop_base_object.h b/os/common/utils/oop/include/oop_base_object.h
index cb45c61ff..4412c9f54 100644
--- a/os/common/utils/oop/include/oop_base_object.h
+++ b/os/common/utils/oop/include/oop_base_object.h
@@ -100,13 +100,13 @@ struct __base_object_vmt {
 /**
  * @brief   Structure representing a base object class.
  */
-typedef struct base_object {
+struct base_object {
   /**
    * @brief   Virtual Methods Table.
    */
   const struct __base_object_vmt *vmt;
   __base_object_data
-} base_object_c;
+};
 
 /**
  * @name    Methods implementations
diff --git a/os/common/utils/oop/include/oop_referenced_object.h b/os/common/utils/oop/include/oop_referenced_object.h
index a2af8f33e..ce6e4a570 100644
--- a/os/common/utils/oop/include/oop_referenced_object.h
+++ b/os/common/utils/oop/include/oop_referenced_object.h
@@ -62,13 +62,13 @@ struct __referenced_object_vmt {                                            \
 /**
  * @brief   Structure representing a referenced object class.
  */
-typedef struct referenced_object {
+struct referenced_object {
   /**
    * @brief   Virtual Methods Table.
    */
   const struct __referenced_object_vmt      *vmt;
   __referenced_object_data
-} referenced_object_c;
+};
 
 /**
  * @name    Methods implementations
diff --git a/os/common/utils/oop/include/oop_synchronized_object.h b/os/common/utils/oop/include/oop_synchronized_object.h
index 3cd49a8b8..cb43e74c8 100644
--- a/os/common/utils/oop/include/oop_synchronized_object.h
+++ b/os/common/utils/oop/include/oop_synchronized_object.h
@@ -62,13 +62,13 @@ struct __synchronized_object_vmt {                                          \
 /**
  * @brief   Structure representing a synchronized object class.
  */
-typedef struct synchronized_object {
+struct synchronized_object {
   /**
    * @brief   Virtual Methods Table.
    */
   const struct __synchronized_object_vmt    *vmt;
   __synchronized_object_data
-} synchronized_object_c;
+};
 
 /**
  * @name    Methods implementations