diff --git a/modules/calib3d/include/opencv2/calib3d.hpp b/modules/calib3d/include/opencv2/calib3d.hpp
index f22c1114b2..61e3aca810 100644
--- a/modules/calib3d/include/opencv2/calib3d.hpp
+++ b/modules/calib3d/include/opencv2/calib3d.hpp
@@ -433,8 +433,6 @@ R & t \\
     Summary:
     Generic camera model @cite Kannala2006 with perspective projection and without distortion correction
 
-    @defgroup calib3d_c C API
-
   @}
  */
 
diff --git a/modules/calib3d/src/calib3d_c_api.h b/modules/calib3d/src/calib3d_c_api.h
index c9ac9b49f5..cdbf021667 100644
--- a/modules/calib3d/src/calib3d_c_api.h
+++ b/modules/calib3d/src/calib3d_c_api.h
@@ -51,10 +51,6 @@
 extern "C" {
 #endif
 
-/** @addtogroup calib3d_c
-  @{
-  */
-
 /****************************************************************************************\
 *                      Camera Calibration, Pose Estimation and Stereo                    *
 \****************************************************************************************/
@@ -416,8 +412,6 @@ void cvUndistortPoints( const CvMat* src, CvMat* dst,
                         const CvMat* R CV_DEFAULT(0),
                         const CvMat* P CV_DEFAULT(0));
 
-/** @} calib3d_c */
-
 #ifdef __cplusplus
 } // extern "C"
 #endif