diff --git a/src/ViewportWidget.cpp b/src/ViewportWidget.cpp
index 6ad5f91..a49e104 100644
--- a/src/ViewportWidget.cpp
+++ b/src/ViewportWidget.cpp
@@ -227,7 +227,7 @@ void ViewportWidget::paintGL()
                 if (m_currentPlane == SketchPlane::XY || m_currentPlane == SketchPlane::XZ) {
                     refDir = QVector3D(1, 0, 0);
                 } else { // YZ
-                    refDir = QVector3D(0, 1, 0);
+                    refDir = QVector3D(0, 0, -1);
                 }
             }
 
@@ -325,7 +325,7 @@ void ViewportWidget::paintGL()
                     refDir = property("previousLineDirection").value<QVector3D>();
                 } else {
                     if (m_currentPlane == SketchPlane::XY || m_currentPlane == SketchPlane::XZ) refDir = QVector3D(1, 0, 0);
-                    else refDir = QVector3D(0, 1, 0);
+                    else refDir = QVector3D(0, 0, -1);
                 }
 
                 if (angleFromInput) {
@@ -577,7 +577,7 @@ void ViewportWidget::paintGL()
                 if (m_currentPlane == SketchPlane::XY || m_currentPlane == SketchPlane::XZ) {
                     refDir = QVector3D(1, 0, 0);
                 } else { // YZ
-                    refDir = QVector3D(0, 1, 0);
+                    refDir = QVector3D(0, 0, -1);
                 }
             }
 
@@ -663,7 +663,7 @@ void ViewportWidget::paintGL()
                 refDir = property("previousLineDirection").value<QVector3D>();
             } else {
                 if (m_currentPlane == SketchPlane::XY || m_currentPlane == SketchPlane::XZ) refDir = QVector3D(1, 0, 0);
-                else refDir = QVector3D(0, 1, 0);
+                else refDir = QVector3D(0, 0, -1);
             }
 
             QVector3D currentMouseWorldPosForText = unproject(m_currentMousePos, m_currentPlane);
@@ -834,7 +834,7 @@ void ViewportWidget::mousePressEvent(QMouseEvent *event)
                         refDir = property("previousLineDirection").value<QVector3D>();
                     } else {
                         if (m_currentPlane == SketchPlane::XY || m_currentPlane == SketchPlane::XZ) refDir = QVector3D(1, 0, 0);
-                        else refDir = QVector3D(0, 1, 0);
+                        else refDir = QVector3D(0, 0, -1);
                     }
                     QVector3D currentMouseWorldPos = unproject(event->pos(), m_currentPlane);
                     QVector3D mouseVec = currentMouseWorldPos - startPos;
@@ -1125,7 +1125,7 @@ void ViewportWidget::keyPressEvent(QKeyEvent *event)
                     refDir = property("previousLineDirection").value<QVector3D>();
                 } else {
                     if (m_currentPlane == SketchPlane::XY || m_currentPlane == SketchPlane::XZ) refDir = QVector3D(1, 0, 0);
-                    else refDir = QVector3D(0, 1, 0);
+                    else refDir = QVector3D(0, 0, -1);
                 }
                 QVector3D currentMouseWorldPos = unproject(m_currentMousePos, m_currentPlane);
                 QVector3D mouseVec = currentMouseWorldPos - startPos;