diff --git a/src/num.rs b/src/num.rs
index 72cdb16..c10cf67 100644
--- a/src/num.rs
+++ b/src/num.rs
@@ -88,7 +88,7 @@ impl BaseInt for u64 {}
 impl BaseInt for uint {}
 
 /// Base floating point types
-pub trait BaseFloat : BaseNum + FloatMath + ApproxEq<Self> + fmt::Float {}
+pub trait BaseFloat : BaseNum + FloatMath + ApproxEq<Self> {}
 
 impl BaseFloat for f32 {}
 impl BaseFloat for f64 {}
diff --git a/src/plane.rs b/src/plane.rs
index 1de0153..1b8fb2e 100644
--- a/src/plane.rs
+++ b/src/plane.rs
@@ -132,7 +132,7 @@ ApproxEq<S> for Plane<S> {
 
 impl<S: BaseFloat> fmt::Show for Plane<S> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{:f}x + {:f}y + {:f}z - {:f} = 0",
+        write!(f, "{}x + {}y + {}z - {} = 0",
                self.n.x, self.n.y, self.n.z, self.d)
     }
 }