diff --git a/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx b/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx
index 9ba28c6ce9..cff7ceddbb 100644
--- a/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx
+++ b/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx
@@ -743,7 +743,8 @@ Standard_Integer NbWaysOut(const BOPAlgo_ListOfEdgeInfo& aLEInfo)
   GeomAbs_CurveType aType;
   Geom2dAdaptor_Curve aGAC2D(aC2D);
   aType=aGAC2D.GetType();
-  if (aType==GeomAbs_BSplineCurve || aType==GeomAbs_BezierCurve) {
+  if (aType==GeomAbs_BSplineCurve || 
+      aType==GeomAbs_BezierCurve) {
     dt=1.1*dt;
   }
   if (fabs (aTV-aFirst) < fabs(aTV - aLast)) {
@@ -753,10 +754,25 @@ Standard_Integer NbWaysOut(const BOPAlgo_ListOfEdgeInfo& aLEInfo)
     aTV1=aTV - dt;
   }
   //
-  aGAC2D.D0 (aTV1, aPV1);
-  aGAC2D.D0 (aTV, aPV);
-  //
-  aV2D = bIsIN ? gp_Vec2d(aPV1, aPV) : gp_Vec2d(aPV, aPV1);
+  if (aType==GeomAbs_Circle) {
+    Standard_Real aTM;
+    TopAbs_Orientation aOrE;
+    gp_Pnt2d aPM;
+    //
+    aTM=0.5*(aTV1+aTV);
+    //
+    aGAC2D.D1(aTM, aPM, aV2D);
+    aOrE=anEdge.Orientation();
+    if (aOrE==TopAbs_REVERSED) {
+      aV2D.Reverse();
+    }
+  }
+  else {
+    aGAC2D.D0 (aTV1, aPV1);
+    aGAC2D.D0 (aTV, aPV);
+    //
+    aV2D = bIsIN ? gp_Vec2d(aPV1, aPV) : gp_Vec2d(aPV, aPV1);
+  }
   //
   gp_Dir2d aDir2D(aV2D);
   anAngle=Angle(aDir2D);
diff --git a/tests/bugs/modalg_2/bug497_3 b/tests/bugs/modalg_2/bug497_3
index 1c0df91ce8..ccb040576f 100755
--- a/tests/bugs/modalg_2/bug497_3
+++ b/tests/bugs/modalg_2/bug497_3
@@ -1,4 +1,5 @@
 puts "TODO OCC25735 ALL: Faulty shapes in variables faulty_1 to"
+puts "TODO OCC26582 ALL: Error : The square of result shape is"
 
 puts "========="
 puts " OCC497 "
diff --git a/tests/bugs/modalg_6/bug26582 b/tests/bugs/modalg_6/bug26582
new file mode 100755
index 0000000000..5c29422e5b
--- /dev/null
+++ b/tests/bugs/modalg_6/bug26582
@@ -0,0 +1,39 @@
+puts "============"
+puts "OCC26582"
+puts "============"
+puts ""
+###############################
+## Wrong result obtained by Common operator.
+###############################
+
+restore [locate_data_file bug26582_bx.brep] bx
+
+explode bx 
+copy bx_1 b1
+copy bx_2 b2
+
+bclearobjects
+bcleartools
+baddobjects b1
+baddtools b2
+
+bfillds
+bbop result 0
+
+set square 39.1778
+
+set nbshapes_expected "
+Number of shapes in shape
+ VERTEX    : 5
+ EDGE      : 7
+ WIRE      : 3
+ FACE      : 3
+ SHELL     : 1
+ SOLID     : 0
+ COMPSOLID : 0
+ COMPOUND  : 1
+ SHAPE     : 20
+"
+checknbshapes result -ref ${nbshapes_expected} -t -m "result obtained by Common operator"
+
+set 3dviewer 1