@@ -51,6 +51,13 @@ def test_uncertainquantity_multiply(self):
         self.assertQuantityEqual(a*2, [2, 4]*pq.m)
         self.assertQuantityEqual((a*2).uncertainty, [0.2,0.4]*pq.m)
 
+    def test_uncertainquantity_negative(self):
+        a = UncertainQuantity([1, 2], 'm', [.1, .2])
+        self.assertQuantityEqual(-a, [-1., -2.]*pq.m)
+        self.assertQuantityEqual((-a).uncertainty, [0.1, 0.2]*pq.m)
+        self.assertQuantityEqual(-a, a*-1)
+        self.assertQuantityEqual((-a).uncertainty, (a*-1).uncertainty)
+
     def test_uncertainquantity_divide(self):
         a = UncertainQuantity([1, 2], 'm', [.1, .2])
         self.assertQuantityEqual(a/a, [1., 1.])
 
@@ -132,6 +132,9 @@ def __mul__(self, other):
     def __rmul__(self, other):
         return self.__mul__(other)
 
+    def __neg__(self):
+        return self*-1
+
     @with_doc(Quantity.__truediv__, use_header=False)
     def __truediv__(self, other):
         res = super(UncertainQuantity, self).__truediv__(other)