diff --git a/src/gui/painting/qbezier.cpp b/src/gui/painting/qbezier.cpp
index c8645e4ef..ad3bfd00d 100644
--- a/src/gui/painting/qbezier.cpp
+++ b/src/gui/painting/qbezier.cpp
@@ -318,7 +318,7 @@ static bool addCircle(const QBezier *b, qreal offset, QBezier *o)
     };
 
     for (int i = 0; i < 2; ++i) {
-        qreal kappa = qreal(2.0) * KAPPA * sign * offset * angles[i];
+        qreal kappa = qreal(2.0) * QT_PATH_KAPPA * sign * offset * angles[i];
 
         o->x1 = circle[i].x();
         o->y1 = circle[i].y();
diff --git a/src/gui/painting/qpaintengineex.cpp b/src/gui/painting/qpaintengineex.cpp
index 97b950c8b..a38baa922 100644
--- a/src/gui/painting/qpaintengineex.cpp
+++ b/src/gui/painting/qpaintengineex.cpp
@@ -631,20 +631,20 @@ void QPaintEngineEx::drawRoundedRect(const QRectF &rect, qreal xRadius, qreal yR
     qreal pts[] = {
         x1 + xRadius, y1,                   // MoveTo
         x2 - xRadius, y1,                   // LineTo
-        x2 - (1 - KAPPA) * xRadius, y1,     // CurveTo
-        x2, y1 + (1 - KAPPA) * yRadius,
+        x2 - (1 - QT_PATH_KAPPA) * xRadius, y1,     // CurveTo
+        x2, y1 + (1 - QT_PATH_KAPPA) * yRadius,
         x2, y1 + yRadius,
         x2, y2 - yRadius,                   // LineTo
-        x2, y2 - (1 - KAPPA) * yRadius,     // CurveTo
-        x2 - (1 - KAPPA) * xRadius, y2,
+        x2, y2 - (1 - QT_PATH_KAPPA) * yRadius,     // CurveTo
+        x2 - (1 - QT_PATH_KAPPA) * xRadius, y2,
         x2 - xRadius, y2,
         x1 + xRadius, y2,                   // LineTo
-        x1 + (1 - KAPPA) * xRadius, y2,           // CurveTo
-        x1, y2 - (1 - KAPPA) * yRadius,
+        x1 + (1 - QT_PATH_KAPPA) * xRadius, y2,           // CurveTo
+        x1, y2 - (1 - QT_PATH_KAPPA) * yRadius,
         x1, y2 - yRadius,
         x1, y1 + yRadius,                   // LineTo
-        x1, y1 + (1 - KAPPA) * yRadius,           // CurveTo
-        x1 + (1 - KAPPA) * xRadius, y1,
+        x1, y1 + (1 - QT_PATH_KAPPA) * yRadius,           // CurveTo
+        x1 + (1 - QT_PATH_KAPPA) * xRadius, y1,
         x1 + xRadius, y1
     };
 
diff --git a/src/gui/painting/qpainterpath_p.h b/src/gui/painting/qpainterpath_p.h
index fc97f1ac0..ea753b9bc 100644
--- a/src/gui/painting/qpainterpath_p.h
+++ b/src/gui/painting/qpainterpath_p.h
@@ -246,11 +246,6 @@ inline void QPainterPathPrivate::maybeMoveTo()
     }
 }
 
-// This value is used to determine the length of control point vectors
-// when approximating arc segments as curves. The factor is multiplied
-// with the radius of the circle.
-#define KAPPA qreal(0.5522847498)
-
 QT_END_NAMESPACE
 
 #endif // QPAINTERPATH_P_H
diff --git a/src/gui/painting/qstroker.cpp b/src/gui/painting/qstroker.cpp
index 7fb1a9e94..02120d3c9 100644
--- a/src/gui/painting/qstroker.cpp
+++ b/src/gui/painting/qstroker.cpp
@@ -26,6 +26,7 @@
 #include "qmath.h"
 #include "qnumeric.h"
 #include "qcorecommon_p.h"
+#include "qguicommon_p.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -743,18 +744,18 @@ template <class Iterator> bool qt_stroke_side(Iterator *it,
 
     For a given angle in the range [0 .. 90], finds the corresponding parameter t
     of the prototype cubic bezier arc segment
-    b = fromPoints(QPointF(1, 0), QPointF(1, KAPPA), QPointF(KAPPA, 1), QPointF(0, 1));
+    b = fromPoints(QPointF(1, 0), QPointF(1, QT_PATH_KAPPA), QPointF(QT_PATH_KAPPA, 1), QPointF(0, 1));
 
     From the bezier equation:
-    b.pointAt(t).x() = (1-t)^3 + t*(1-t)^2 + t^2*(1-t)*KAPPA
-    b.pointAt(t).y() = t*(1-t)^2 * KAPPA + t^2*(1-t) + t^3
+    b.pointAt(t).x() = (1-t)^3 + t*(1-t)^2 + t^2*(1-t)*QT_PATH_KAPPA
+    b.pointAt(t).y() = t*(1-t)^2 * QT_PATH_KAPPA + t^2*(1-t) + t^3
 
     Third degree coefficients:
     b.pointAt(t).x() = at^3 + bt^2 + ct + d
-    where a = 2-3*KAPPA, b = 3*(KAPPA-1), c = 0, d = 1
+    where a = 2-3*QT_PATH_KAPPA, b = 3*(QT_PATH_KAPPA-1), c = 0, d = 1
 
     b.pointAt(t).y() = at^3 + bt^2 + ct + d
-    where a = 3*KAPPA-2, b = 6*KAPPA+3, c = 3*KAPPA, d = 0
+    where a = 3*QT_PATH_KAPPA-2, b = 6*QT_PATH_KAPPA+3, c = 3*QT_PATH_KAPPA, d = 0
 
     Newton's method to find the zero of a function:
     given a function f(x) and initial guess x_0
diff --git a/src/gui/painting/qstroker_p.h b/src/gui/painting/qstroker_p.h
index 5e5f1cd6a..2ab73ede4 100644
--- a/src/gui/painting/qstroker_p.h
+++ b/src/gui/painting/qstroker_p.h
@@ -47,8 +47,6 @@ struct qfixed2d
                                                        && qFuzzyCompare(y, other.y); }
 };
 
-#define QT_PATH_KAPPA 0.5522847498
-
 QPointF qt_curves_for_arc(const QRectF &rect, qreal startAngle, qreal sweepLength,
                           QPointF *controlPoints, int *point_count);
 
diff --git a/src/gui/qguicommon_p.h b/src/gui/qguicommon_p.h
index 6b0f9031b..a521e235c 100644
--- a/src/gui/qguicommon_p.h
+++ b/src/gui/qguicommon_p.h
@@ -9,6 +9,11 @@
 
 QT_BEGIN_NAMESPACE
 
+// This value is used to determine the length of control point vectors
+// when approximating arc segments as curves. The factor is multiplied
+// with the radius of the circle.
+#define QT_PATH_KAPPA qreal(0.5522847498)
+
 struct QRealRect {
     qreal x1, y1, x2, y2;
 };