diff --git a/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.cpp b/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.cpp
index 5d60d724d..f9e801bf3 100644
--- a/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.cpp
+++ b/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.cpp
@@ -129,9 +129,11 @@ void TaskLinearPatternParameters::setupUI()
 
     ui->comboDirection->setEnabled(true);
     ui->checkReverse->setEnabled(true);
+    ui->spinLength->blockSignals(true);
     ui->spinLength->setEnabled(true);
+    ui->spinLength->setUnit(Base::Unit::Length);
+    ui->spinLength->blockSignals(false);
     ui->spinOccurrences->setEnabled(true);
-    ui->spinLength->setDecimals(Base::UnitsApi::getDecimals());
     updateUI();
 }
 
@@ -370,7 +372,7 @@ const bool TaskLinearPatternParameters::getReverse(void) const
 
 const double TaskLinearPatternParameters::getLength(void) const
 {
-    return ui->spinLength->value();
+    return ui->spinLength->value().getValue();
 }
 
 const unsigned TaskLinearPatternParameters::getOccurrences(void) const
diff --git a/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.ui b/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.ui
index 913e46eeb..35b31c4e8 100644
--- a/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.ui
+++ b/src/Mod/PartDesign/Gui/TaskLinearPatternParameters.ui
@@ -75,12 +75,9 @@
       </widget>
      </item>
      <item>
-      <widget class="QDoubleSpinBox" name="spinLength">
-       <property name="decimals">
-        <number>3</number>
-       </property>
-       <property name="maximum">
-        <double>999999.000000000000000</double>
+      <widget class="Gui::QuantitySpinBox" name="spinLength">
+       <property name="unit" stdset="0">
+        <string>mm</string>
        </property>
        <property name="value">
         <double>100.000000000000000</double>
@@ -146,6 +143,13 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>Gui::QuantitySpinBox</class>
+   <extends>QWidget</extends>
+   <header>Gui/QuantitySpinBox.h</header>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections/>
 </ui>