diff --git a/src/Math/Test/AngleTest.cpp b/src/Math/Test/AngleTest.cpp
index 1feba3aa8..cdc3b3eba 100644
--- a/src/Math/Test/AngleTest.cpp
+++ b/src/Math/Test/AngleTest.cpp
@@ -128,10 +128,11 @@ void AngleTest::literals() {
 }
 
 void AngleTest::conversion() {
-    constexpr Deg a(Rad(1.57079633f));
+    /* Implicit conversion should be allowed */
+    constexpr Deg a = Rad(1.57079633f);
     CORRADE_COMPARE(Float(a), 90.0f);
 
-    constexpr Rad b(Deg(90.0f));
+    constexpr Rad b = Deg(90.0f);
     CORRADE_COMPARE(Float(b), 1.57079633f);
 }
 
diff --git a/src/Math/Test/UnitTest.cpp b/src/Math/Test/UnitTest.cpp
index 1951fd127..805b0a4b1 100644
--- a/src/Math/Test/UnitTest.cpp
+++ b/src/Math/Test/UnitTest.cpp
@@ -64,6 +64,10 @@ inline Corrade::Utility::Debug operator<<(Corrade::Utility::Debug debug, Sec val
 void UnitTest::construct() {
     constexpr Sec a(25.0f);
     CORRADE_COMPARE(Float(a), 25.0f);
+
+    /* Implicit conversion is not allowed */
+    CORRADE_VERIFY(!(std::is_convertible<Float, Sec>::value));
+    CORRADE_VERIFY(!(std::is_convertible<Sec, Float>::value));
 }
 
 void UnitTest::constructDefault() {
@@ -75,6 +79,9 @@ void UnitTest::constructConversion() {
     constexpr Seci a(25.0);
     constexpr Sec b(a);
     CORRADE_COMPARE(b, Sec(25.0f));
+
+    /* Implicit conversion is not allowed */
+    CORRADE_VERIFY(!(std::is_convertible<Sec, Seci>::value));
 }
 
 void UnitTest::compare() {