diff --git a/src/value/parse.rs b/src/value/parse.rs
index 7345a0a..04c6520 100644
--- a/src/value/parse.rs
+++ b/src/value/parse.rs
@@ -897,7 +897,7 @@ impl Value {
             ':' | '?' | ')' | '@' | '^' | ']' | '|' => {
                 return Some(Err(("expected \";\".", span).into()))
             }
-            v if v as u32 >= 0x80 || v.is_control() || v == '`' => {
+            v if v as u32 >= 0x80 || v.is_control() || v == '`' || v == '~' => {
                 return Some(Err(("Expected expression.", span).into()))
             }
             v => todo!("unexpected token in value parsing: {:?}", v),
diff --git a/tests/error.rs b/tests/error.rs
index 66cde91..cbc53c5 100644
--- a/tests/error.rs
+++ b/tests/error.rs
@@ -125,3 +125,7 @@ error!(
 error!(toplevel_hash, "#", "Error: expected \"{\".");
 error!(toplevel_var_no_colon, "$r", "Error: expected \":\".");
 error!(bar_in_value, "a {color: a|b;}", "Error: expected \";\".");
+error!(
+    tilde_in_value,
+    "a {color: ~a;}", "Error: Expected expression."
+);