diff --git a/test/channel/algorithm_channel_arithmetic.cpp b/test/channel/algorithm_channel_arithmetic.cpp
index 78ee3a575..e569096d8 100644
--- a/test/channel/algorithm_channel_arithmetic.cpp
+++ b/test/channel/algorithm_channel_arithmetic.cpp
@@ -27,6 +27,7 @@ void test_channel_arithmetic_mutable(boost::mpl::true_)
     using channel_value_t = typename fixture_t::channel_value_t;
     fixture_t f;
     channel_value_t const v = f.min_v_;
+    channel_value_t const one = 1;
 
     ++f.min_v_;
     f.min_v_++;
@@ -34,16 +35,16 @@ void test_channel_arithmetic_mutable(boost::mpl::true_)
     f.min_v_--;
     BOOST_TEST(v == f.min_v_);
 
-    f.min_v_ += 1;
-    f.min_v_ -= 1;
+    f.min_v_ += one;
+    f.min_v_ -= one;
     BOOST_TEST(v == f.min_v_);
 
-    f.min_v_ *= 1;
-    f.min_v_ /= 1;
+    f.min_v_ *= one;
+    f.min_v_ /= one;
     BOOST_TEST(v == f.min_v_);
 
-    f.min_v_ = 1; // assignable to scalar
-    BOOST_TEST(f.min_v_ == 1);
+    f.min_v_ = one; // assignable to scalar
+    BOOST_TEST(f.min_v_ == one);
     f.min_v_ = v; // and to value type
     BOOST_TEST(f.min_v_ == v);
 
diff --git a/test/channel/algorithm_channel_relation.cpp b/test/channel/algorithm_channel_relation.cpp
index 4fab441a9..258ffce99 100644
--- a/test/channel/algorithm_channel_relation.cpp
+++ b/test/channel/algorithm_channel_relation.cpp
@@ -18,14 +18,18 @@ namespace fixture = boost::gil::test::fixture;
 template <typename ChannelFixtureBase>
 void test_channel_relation()
 {
-    fixture::channel<ChannelFixtureBase> f;
+    using fixture_t = fixture::channel<ChannelFixtureBase>;
+    using channel_value_t = typename fixture_t::channel_value_t;
+    channel_value_t const one = 1;
+
+    fixture_t f;
     BOOST_TEST(f.min_v_ <= f.max_v_);
     BOOST_TEST(f.max_v_ >= f.min_v_);
     BOOST_TEST(f.min_v_ < f.max_v_);
     BOOST_TEST(f.max_v_ > f.min_v_);
     BOOST_TEST(f.max_v_ != f.min_v_);
     BOOST_TEST(f.min_v_ == f.min_v_);
-    BOOST_TEST(f.min_v_ != 1); // comparable to integral
+    BOOST_TEST(f.min_v_ != one); // comparable to integral
 }
 
 BOOST_AUTO_TEST_CASE_TEMPLATE(channel_value, Channel, fixture::channel_byte_types)