diff --git a/src/builtin/color/hsl.rs b/src/builtin/color/hsl.rs
index d064aad..b1982f6 100644
--- a/src/builtin/color/hsl.rs
+++ b/src/builtin/color/hsl.rs
@@ -8,20 +8,16 @@ use crate::value::{Number, Value};
 pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
     decl!(f "hsl", |args, _| {
         let hue = match arg!(args, 0, "hue").eval() {
-            Value::Dimension(n, Unit::None)
-            | Value::Dimension(n, Unit::Percent)
-            | Value::Dimension(n, Unit::Deg) => n,
-            _ => todo!("expected either unitless or % number for alpha"),
+            Value::Dimension(n, _) => n,
+            _ => todo!("$hue: ____ is not a number."),
         };
         let saturation = match arg!(args, 1, "saturation").eval() {
-            Value::Dimension(n, Unit::None)
-            | Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for alpha"),
+            Value::Dimension(n, _) => n / Number::from(100),
+            _ => todo!("$saturation: ____ is not a number."),
         };
         let luminance = match arg!(args, 2, "luminance").eval() {
-            Value::Dimension(n, Unit::None)
-            | Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for alpha"),
+            Value::Dimension(n, _) => n / Number::from(100),
+            _ => todo!("$luminance: ____ is not a number."),
         };
         let alpha = match arg!(args, 3, "alpha"=Value::Dimension(Number::from(1), Unit::None)) {
             Value::Dimension(n, Unit::None) => n,
@@ -32,25 +28,21 @@ pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
     });
     decl!(f "hsla", |args, _| {
         let hue = match arg!(args, 0, "hue").eval() {
-            Value::Dimension(n, Unit::None)
-            | Value::Dimension(n, Unit::Percent)
-            | Value::Dimension(n, Unit::Deg) => n,
-            _ => todo!("expected either unitless or % number for alpha"),
+            Value::Dimension(n, _) => n,
+            _ => todo!("$hue: ____ is not a number."),
         };
         let saturation = match arg!(args, 1, "saturation").eval() {
-            Value::Dimension(n, Unit::None)
-            | Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for alpha"),
+            Value::Dimension(n, _) => n / Number::from(100),
+            _ => todo!("$saturation: ____ is not a number."),
         };
         let luminance = match arg!(args, 2, "luminance").eval() {
-            Value::Dimension(n, Unit::None)
-            | Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for alpha"),
+            Value::Dimension(n, _) => n / Number::from(100),
+            _ => todo!("$luminance: ____ is not a number."),
         };
         let alpha = match arg!(args, 3, "alpha").eval() {
             Value::Dimension(n, Unit::None) => n,
             Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for alpha"),
+            _ => todo!("$alpha: Expected ____ to have no units or \"%\"."),
         };
         Ok(Value::Color(Color::from_hsla(hue, saturation, luminance, alpha)))
     });
diff --git a/tests/color.rs b/tests/color.rs
index f01c922..d697e36 100644
--- a/tests/color.rs
+++ b/tests/color.rs
@@ -133,6 +133,11 @@ test!(
     "a {\n  color: hsla(193, 67%, 99, .6);\n}\n",
     "a {\n  color: rgba(251, 253, 254, 0.6);\n}\n"
 );
+test!(
+    hsl_doesnt_care_about_units,
+    "a {\n  color: hsl(193deg, 67foo, 99%);\n}\n",
+    "a {\n  color: #fbfdfe;\n}\n"
+);
 test!(
     hsl_named,
     "a {\n  color: hsl($hue: 193, $saturation: 67%, $luminance: 99);\n}\n",