diff --git a/src/function.rs b/src/function.rs
index d6a3a53..a72fa99 100644
--- a/src/function.rs
+++ b/src/function.rs
@@ -133,13 +133,44 @@ pub fn eat_call_args<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) -> CallA
         match kind {
             TokenKind::Variable(v) => name = Some(v),
             TokenKind::Symbol(Symbol::Colon) => {
-                todo!("handle default values")
-                // let mut val: Vec<Token> = Vec::new();
-                // while let Some(Token { kind, .. }) = toks.next() {
-                //     match &kind {
-                //         _ => {}
-                //     }
-                // }
+                devour_whitespace(toks);
+                while let Some(tok) = toks.peek() {
+                    match &tok.kind {
+                        TokenKind::Symbol(Symbol::Comma) => {
+                            toks.next();
+                            args.insert(
+                                name.clone().unwrap(),
+                                CallArg {
+                                    name: name.clone(),
+                                    val: val.clone(),
+                                },
+                            );
+                            if let Some(ref mut s) = name {
+                                s.clear();
+                            }
+                            val.clear();
+                            break;
+                        }
+                        TokenKind::Symbol(Symbol::CloseParen) => {
+                            args.insert(
+                                name.clone().unwrap(),
+                                CallArg {
+                                    name: name.clone(),
+                                    val: val.clone(),
+                                },
+                            );
+                            if let Some(ref mut s) = name {
+                                s.clear();
+                            }
+                            val.clear();
+                            break;
+                        }
+                        _ => {
+                            let tok = toks.next().expect("we know this exists!");
+                            val.push(tok)
+                        }
+                    }
+                }
             }
             TokenKind::Symbol(Symbol::CloseParen) => {
                 if name.is_some() {
@@ -150,11 +181,11 @@ pub fn eat_call_args<I: Iterator<Item = Token>>(toks: &mut Peekable<I>) -> CallA
                 break;
             }
             TokenKind::Symbol(Symbol::Comma) => {
-                if name.is_some() {
+                if let Some(ref name) = name {
                     args.insert(
-                        name.clone().unwrap(),
+                        name.clone(),
                         CallArg {
-                            name: name.clone(),
+                            name: Some(name.clone()),
                             val: val.clone(),
                         },
                     );
diff --git a/src/main.rs b/src/main.rs
index b4591cc..65f467c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1154,6 +1154,31 @@ mod test_mixins {
         "@mixin a($a: red) {\n  color: $a;\n}\nd {\n  @include a(blue);\n}\n",
         "d {\n  color: blue;\n}\n"
     );
+    test!(
+        mixin_keyword_arg,
+        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: blue);\n}\n",
+        "d {\n  color: blue;\n}\n"
+    );
+    test!(
+        mixin_keyword_arg_override_default,
+        "@mixin a($a: red) {\n  color: $a;\n}\nd {\n  @include a($a: blue);\n}\n",
+        "d {\n  color: blue;\n}\n"
+    );
+    test!(
+        mixin_keyword_applies_to_second_arg,
+        "@mixin a($a: red, $b) {\n  color: $a $b;\n}\nd {\n  @include a($b: blue);\n}\n",
+        "d {\n  color: red blue;\n}\n"
+    );
+    test!(
+        mixin_two_keywords,
+        "@mixin a($a, $b) {\n  color: $a $b;\n}\nd {\n  @include a($a: red, $b: blue);\n}\n",
+        "d {\n  color: red blue;\n}\n"
+    );
+    test!(
+        mixin_two_keywords_wrong_direction,
+        "@mixin a($a, $b) {\n  color: $a $b;\n}\nd {\n  @include a($b: blue, $a: red);\n}\n",
+        "d {\n  color: red blue;\n}\n"
+    );
 }
 
 #[cfg(test)]