diff --git a/.travis.yml b/.travis.yml
index 3701d1c..ee292cb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@ language: rust
 
 rust:
     - nightly
+    - beta
     - stable
 
 os:
@@ -11,4 +12,5 @@ os:
 script:
     - cargo build --verbose
     - cargo test --verbose
+    - cargo test --features="serde_serialization" --verbose
     - cargo doc --verbose
diff --git a/Cargo.toml b/Cargo.toml
index d43b11e..0032750 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "envelope"
 description = "An interpolatable Envelope trait along with a generic 2D Point trait. Useful for controlling parameters over time."
-version = "0.8.0"
+version = "0.8.1"
 authors = ["mitchmindtree <mitchell.nordine@gmail.com>"]
 readme = "README.md"
 keywords = ["interpolate", "dsp", "audio", "time", "2D"]
diff --git a/src/interpolate.rs b/src/interpolate.rs
index 031abd4..d0aa97e 100644
--- a/src/interpolate.rs
+++ b/src/interpolate.rs
@@ -77,6 +77,14 @@ pub fn ease<P>(x: P::X, start: &P, end: &P, ease_fn: EaseFunction) -> P::Y
 }
 
 
+/// Get bezier point for bezier curve.
+#[inline]
+fn bezier_pt<T>(n1: T, n2: T, perc: T) -> T
+    where T: Scalar
+{
+    (n2 - n1.clone()) * perc + n1
+}
+
 /// Interpolate between the given start and end points given some bezier curve.
 #[inline]
 pub fn bezier<P>(x: P::X, start: &P, end: &P, curve: <P::Y as Spatial>::Scalar) -> P::Y
@@ -85,15 +93,6 @@ pub fn bezier<P>(x: P::X, start: &P, end: &P, curve: <P::Y as Spatial>::Scalar)
           <P::Y as Spatial>::Scalar: Scalar + NumCast,
 {
     maybe_exact_point(&x, start, end).unwrap_or_else(|| {
-
-        /// Get bezier point for bezier curve.
-        #[inline]
-        fn bezier_pt<T>(n1: T, n2: T, perc: T) -> T
-            where T: Scalar
-        {
-            (n2 - n1.clone()) * perc + n1
-        }
-
         let x = P::x_to_scalar(x.clone());
         let start_x = P::x_to_scalar(start.x());
         let end_x = P::x_to_scalar(end.x());