diff --git a/modules/aruco/include/opencv2/aruco/board.hpp b/modules/aruco/include/opencv2/aruco/board.hpp
index f76f2f36b..51d0248bc 100644
--- a/modules/aruco/include/opencv2/aruco/board.hpp
+++ b/modules/aruco/include/opencv2/aruco/board.hpp
@@ -125,8 +125,8 @@ public:
                                          const Ptr<Dictionary> &dictionary, int firstMarker = 0);
 
     CV_WRAP Size getGridSize() const;
-    CV_WRAP float getMarkerLength();
-    CV_WRAP float getMarkerSeparation();
+    CV_WRAP float getMarkerLength() const;
+    CV_WRAP float getMarkerSeparation() const;
 
 protected:
     struct GridImpl;
diff --git a/modules/aruco/src/board.cpp b/modules/aruco/src/board.cpp
index 2920b4854..94f88b01f 100644
--- a/modules/aruco/src/board.cpp
+++ b/modules/aruco/src/board.cpp
@@ -194,11 +194,11 @@ Size GridBoard::getGridSize() const {
     return Size(gridImpl->sizeX, gridImpl->sizeY);
 }
 
-float GridBoard::getMarkerLength() {
+float GridBoard::getMarkerLength() const {
     return gridImpl->markerLength;
 }
 
-float GridBoard::getMarkerSeparation() {
+float GridBoard::getMarkerSeparation() const {
     return gridImpl->markerSeparation;
 }