diff --git a/test/maths/fast.cpp b/test/maths/fast.cpp
index 3f535c08..4a01b28b 100644
--- a/test/maths/fast.cpp
+++ b/test/maths/fast.cpp
@@ -63,8 +63,8 @@ main ()
 
     cruft::TAP::logger tap;
 
-    for (unsigned i = 0; i < std::size (sins); ++i) {
-        const auto theta = cruft::pi<float> / 4 * i / (std::size (sins)-1);
+    for (std::size_t i = 0; i < std::size (sins); ++i) {
+        const auto theta = cruft::pi<float> / 4 * static_cast<float> (i) / (std::size (sins) - 1);
         const auto value = cruft::maths::fast::sin (theta);
 
         const auto abserr = std::abs (sins[i] - value);
@@ -72,9 +72,9 @@ main ()
         successes.sin += (abserr < 1e-32f || cruft::relatively_equal (sins[i], value, 1e-6f)) ? 1 : 0;
     }
 
-    for (unsigned int i = 0; i < std::size (exps); ++i) {
+    for (std::size_t i = 0; i < std::size (exps); ++i) {
         static constexpr float half_log2 = 0.34657359027997265470861606072908828403775006718012f;
-        const auto exponent = half_log2 * i / (std::size (exps)-1);
+        const auto exponent = half_log2 * static_cast<float> (i) / (std::size (exps)-1);
         const auto value = cruft::maths::fast::exp (exponent);
 
         const auto abserr = std::abs (exps[i] - value);