diff --git a/src/Mod/Test/UnitTests.py b/src/Mod/Test/UnitTests.py
index 4726e46037..e35da07fef 100644
--- a/src/Mod/Test/UnitTests.py
+++ b/src/Mod/Test/UnitTests.py
@@ -181,3 +181,6 @@ class UnitBasicCases(unittest.TestCase):
             FreeCAD.Units.toNumber(1023, 'gg', 2)
         with self.assertRaises(ValueError):
             FreeCAD.Units.toNumber(1023, 's', 2)
+
+    def testIssue6735(self):
+        FreeCAD.Units.Quantity("1400.0 N/mm^2")