diff --git a/src/value/parse.rs b/src/value/parse.rs
index 07838f8..521ff97 100644
--- a/src/value/parse.rs
+++ b/src/value/parse.rs
@@ -606,7 +606,7 @@ impl Value {
                     Ok(IntermediateValue::Op(Op::Div))
                 }
             }
-            ':' => Err("expected \";\".".into()),
+            ':' | '?' => Err("expected \";\".".into()),
             v if v.is_control() => Err("Expected expression.".into()),
             v => {
                 dbg!(v);
diff --git a/tests/error.rs b/tests/error.rs
index 4b0e460..b6b9792 100644
--- a/tests/error.rs
+++ b/tests/error.rs
@@ -20,6 +20,10 @@ error!(
     "a {@return foo;}", "Error: This at-rule is not allowed here."
 );
 error!(
-    colon_inside_style,
+    colon_inside_value,
     "a {foo: bar: baz;}", "Error: expected \";\"."
-);
\ No newline at end of file
+);
+error!(
+    question_mark_inside_value,
+    "a {foo: bar?}", "Error: expected \";\"."
+);