diff --git a/src/parse/value/parse.rs b/src/parse/value/parse.rs
index 67f808f..4e96042 100644
--- a/src/parse/value/parse.rs
+++ b/src/parse/value/parse.rs
@@ -850,6 +850,13 @@ impl<'a> Parser<'a> {
                 IntermediateValue::Op(Op::Plus).span(span)
             }
             '-' => {
+                if matches!(self.toks.peek(), Some(Token { kind: '#', .. }))
+                    && matches!(self.toks.peek_next(), Some(Token { kind: '{', .. }))
+                {
+                    self.toks.reset_cursor();
+                    return Some(self.parse_ident_value(predicate));
+                }
+                self.toks.reset_cursor();
                 let span = self.toks.next().unwrap().pos();
                 IntermediateValue::Op(Op::Minus).span(span)
             }
diff --git a/tests/subtraction.rs b/tests/subtraction.rs
index 3e7ce15..f883fe8 100644
--- a/tests/subtraction.rs
+++ b/tests/subtraction.rs
@@ -192,7 +192,6 @@ test!(
     "a {\n  color: 0;\n}\n"
 );
 test!(
-    #[ignore]
     sub_no_space_interpolation,
     "a {\n  color: 10-#{10};\n}\n",
     "a {\n  color: 10 -10;\n}\n"
@@ -287,6 +286,10 @@ error!(
     number_minus_color,
     "a {\n  color: 1 - #abc;\n}\n", "Error: Undefined operation \"1 - #abc\"."
 );
+error!(
+    number_minus_hex_color_no_space,
+    "a {\n  color: 1-#abc;\n}\n", "Error: Undefined operation \"1 - #abc\"."
+);
 error!(
     null_minus_function,
     "a {\n  color: null - get-function(lighten);\n}\n",