diff --git a/test/unit_test/runtime/magnitude_test.cpp b/test/unit_test/runtime/magnitude_test.cpp
index e9b359f2..40c8c1b1 100644
--- a/test/unit_test/runtime/magnitude_test.cpp
+++ b/test/unit_test/runtime/magnitude_test.cpp
@@ -25,7 +25,10 @@
 #include <units/ratio.h>
 #include <type_traits>
 
-namespace units {
+using namespace units;
+using namespace units::detail;
+
+namespace {
 
 // A set of non-standard bases for testing purposes.
 struct noninteger_base {
@@ -313,7 +316,8 @@ TEST_CASE("can distinguish integral, rational, and irrational magnitudes")
   }
 }
 
-namespace detail {
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Detail function tests below.
 
 TEST_CASE("int_power computes integer powers")
 {
@@ -473,6 +477,4 @@ TEST_CASE("strictly_increasing")
   }
 }
 
-}  // namespace detail
-
-}  // namespace units
+}  // namespace
diff --git a/test/unit_test/static/prime_test.cpp b/test/unit_test/static/prime_test.cpp
index 26e9478d..9cb017b6 100644
--- a/test/unit_test/static/prime_test.cpp
+++ b/test/unit_test/static/prime_test.cpp
@@ -24,7 +24,9 @@
 #include <type_traits>
 #include <utility>
 
-namespace units::detail {
+using namespace units::detail;
+
+namespace {
 
 template<std::size_t BasisSize, std::size_t... Is>
 constexpr bool check_primes(std::index_sequence<Is...>)
@@ -71,4 +73,4 @@ static_assert(!WheelFactorizer<3>::is_prime(0));
 static_assert(!WheelFactorizer<3>::is_prime(1));
 static_assert(WheelFactorizer<3>::is_prime(2));
 
-}  // namespace units::detail
+}  // namespace