diff --git a/src/libcore/num/f32.rs b/src/libcore/num/f32.rs
index 3586fa5442fb4..38517c5f9c660 100644
--- a/src/libcore/num/f32.rs
+++ b/src/libcore/num/f32.rs
@@ -239,9 +239,7 @@ impl Float for f32 {
     /// Converts to degrees, assuming the number is in radians.
     #[inline]
     fn to_degrees(self) -> f32 {
-        // Use a constant for better precision.
-        const PIS_IN_180: f32 = 57.2957795130823208767981548141051703_f32;
-        self * PIS_IN_180
+        (self as f64).to_degrees() as f32
     }
 
     /// Converts to radians, assuming the number is in degrees.
diff --git a/src/libstd/f32.rs b/src/libstd/f32.rs
index a760922115aef..be47604ee7180 100644
--- a/src/libstd/f32.rs
+++ b/src/libstd/f32.rs
@@ -1532,6 +1532,10 @@ mod tests {
         assert_eq!(inf.to_degrees(), inf);
         assert_eq!(neg_inf.to_degrees(), neg_inf);
         assert_eq!(1_f32.to_degrees(), 57.2957795130823208767981548141051703);
+        assert_eq!(f32::consts::FRAC_PI_6.to_degrees(), 30.0f32);
+        assert_eq!(f32::consts::FRAC_PI_3.to_degrees(), 60.0f32);
+        assert_eq!(30.0f32.to_degrees().to_radians(), 30.0f32);
+        assert_eq!(30.0f32.to_radians().to_degrees(), 30.0f32);
     }
 
     #[test]