diff --git a/src/value/ops.rs b/src/value/ops.rs
index fbcccdd..2d153de 100644
--- a/src/value/ops.rs
+++ b/src/value/ops.rs
@@ -120,6 +120,9 @@ impl Sub for Value {
                 Self::List(..) => {
                     Value::Ident(format!("{}{}-{}", num, unit, other), QuoteKind::None)
                 }
+                Self::Ident(..) => {
+                    Value::Ident(format!("{}{}-{}", num, unit, other), QuoteKind::None)
+                }
                 _ => todo!(),
             },
             Self::Color(c) => match other {
diff --git a/tests/subtraction.rs b/tests/subtraction.rs
index 7b14e01..e43729f 100644
--- a/tests/subtraction.rs
+++ b/tests/subtraction.rs
@@ -153,3 +153,18 @@ test!(
     "a {\n  color: 'foo' - 1px;\n}\n",
     "a {\n  color: \"foo\"-1px;\n}\n"
 );
+test!(
+    number_minus_unquoted_ident,
+    "a {\n  color: 1 - foo;\n}\n",
+    "a {\n  color: 1-foo;\n}\n"
+);
+test!(
+    number_minus_sglquoted_ident,
+    "a {\n  color: 1 - 'foo';\n}\n",
+    "a {\n  color: 1-\"foo\";\n}\n"
+);
+test!(
+    number_minus_dblquoted_ident,
+    "a {\n  color: 1 - \"foo\";\n}\n",
+    "a {\n  color: 1-\"foo\";\n}\n"
+);