diff --git a/modules/flann/include/opencv2/flann/general.h b/modules/flann/include/opencv2/flann/general.h
index fcdff5013e..ab2b26dde7 100644
--- a/modules/flann/include/opencv2/flann/general.h
+++ b/modules/flann/include/opencv2/flann/general.h
@@ -28,8 +28,8 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *************************************************************************/
 
-#ifndef CONSTANTS_H
-#define CONSTANTS_H
+#ifndef OPENCV_CONSTANTS_H
+#define OPENCV_CONSTANTS_H
 
 #ifdef __cplusplus
 
@@ -146,4 +146,4 @@ struct CV_EXPORTS SearchParams {
 
 #endif
 
-#endif  /* CONSTANTS_H */
+#endif  /* OPENCV_CONSTANTS_H */
diff --git a/modules/flann/include/opencv2/flann/object_factory.h b/modules/flann/include/opencv2/flann/object_factory.h
index 3aa5d13309..dd3846d299 100644
--- a/modules/flann/include/opencv2/flann/object_factory.h
+++ b/modules/flann/include/opencv2/flann/object_factory.h
@@ -28,8 +28,8 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *************************************************************************/
 
-#ifndef OBJECT_FACTORY_H_
-#define OBJECT_FACTORY_H_
+#ifndef OPENCV_OBJECT_FACTORY_H_
+#define OPENCV_OBJECT_FACTORY_H_
 
 #include "opencv2/core/types_c.h"
 #include <map>