diff --git a/maths.hpp b/maths.hpp
index 1cbb37e9..9293fbcd 100644
--- a/maths.hpp
+++ b/maths.hpp
@@ -154,6 +154,13 @@ to_degrees (double radians) {
     return radians * 180 / PI;
 }
 
+//-----------------------------------------------------------------------------
+constexpr float
+to_radians (float degrees) {
+    return degrees / 180 * static_cast<float> (PI);
+}
+
+
 constexpr double
 to_radians (double degrees) {
     return degrees / 180 * PI;
diff --git a/test/maths/maths.cpp b/test/maths/maths.cpp
index 4d70735f..69eb3c67 100644
--- a/test/maths/maths.cpp
+++ b/test/maths/maths.cpp
@@ -40,7 +40,8 @@ main (int, char **) {
     CHECK_EQ (sign (-numeric_limits<double>::infinity ()), -1);
 
     CHECK_EQ (to_degrees (PI),  180);
-    CHECK_EQ (to_radians (180),  PI);
+    CHECK_EQ (to_radians (180.f),  PI);
+    CHECK_EQ (to_radians (180.0),  PI);
 
     CHECK_EQ (log2 (8u), 3);
     CHECK_EQ (log2 (1u), 0);