diff --git a/src/error.rs b/src/error.rs
index 4cca1069..6f87f5d4 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -364,7 +364,10 @@ pub enum MinifyErrorKind {
     custom_media_loc: Location,
   },
   /// A CSS module selector did not contain at least one class or id selector.
-  ImpureCSSModuleSelector,
+  ImpureCSSModuleSelector {
+    /// The impure selector.
+    selector: String,
+  },
 }
 
 impl fmt::Display for MinifyErrorKind {
@@ -377,9 +380,10 @@ impl fmt::Display for MinifyErrorKind {
         f,
         "Boolean logic with media types in @custom-media rules is not supported by Lightning CSS"
       ),
-      ImpureCSSModuleSelector => write!(
+      ImpureCSSModuleSelector { selector } => write!(
         f,
-        "A selector in CSS modules should contain at least one class or ID selector"
+        "Selector \"{}\" is not pure. Pure selectors must contain at least one local class or id.",
+        selector
       ),
     }
   }
diff --git a/src/lib.rs b/src/lib.rs
index bcd47649..11e9ac99 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7062,22 +7062,30 @@ mod tests {
 
     minify_error_test_with_options(
       "div {width: 20px}",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "div".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_error_test_with_options(
       ":global(.foo) {width: 20px}",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: ".foo".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_error_test_with_options(
       "[foo=bar] {width: 20px}",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "[foo=\"bar\"]".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_error_test_with_options(
       "div, .foo {width: 20px}",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "div, .foo".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_test_with_options(
@@ -7127,7 +7135,9 @@ mod tests {
     );
     minify_error_test_with_options(
       "html { .foo { span { color: red; } } }",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "html".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_test_with_options(
@@ -7137,17 +7147,23 @@ mod tests {
     );
     minify_error_test_with_options(
       "@scope (div) { .foo { color: red } }",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "div".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_error_test_with_options(
       "@scope (.a) to (div) { .foo { color: red } }",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "div".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_error_test_with_options(
       "@scope (.a) to (.b) { div { color: red } }",
-      MinifyErrorKind::ImpureCSSModuleSelector,
+      MinifyErrorKind::ImpureCSSModuleSelector {
+        selector: "div".to_string(),
+      },
       pure_css_module_options.clone(),
     );
     minify_test_with_options(
diff --git a/src/rules/scope.rs b/src/rules/scope.rs
index ab7d1004..9bff25d7 100644
--- a/src/rules/scope.rs
+++ b/src/rules/scope.rs
@@ -43,7 +43,9 @@ impl<'i, T: Clone> ScopeRule<'i, T> {
       if let Some(scope_start) = &self.scope_start {
         if !scope_start.0.iter().all(is_pure_css_modules_selector) {
           return Err(MinifyError {
-            kind: crate::error::MinifyErrorKind::ImpureCSSModuleSelector,
+            kind: crate::error::MinifyErrorKind::ImpureCSSModuleSelector {
+              selector: scope_start.to_string(),
+            },
             loc: self.loc,
           });
         }
@@ -52,7 +54,9 @@ impl<'i, T: Clone> ScopeRule<'i, T> {
       if let Some(scope_end) = &self.scope_end {
         if !scope_end.0.iter().all(is_pure_css_modules_selector) {
           return Err(MinifyError {
-            kind: crate::error::MinifyErrorKind::ImpureCSSModuleSelector,
+            kind: crate::error::MinifyErrorKind::ImpureCSSModuleSelector {
+              selector: scope_end.to_string(),
+            },
             loc: self.loc,
           });
         }
diff --git a/src/rules/style.rs b/src/rules/style.rs
index ce3cd459..33b74c62 100644
--- a/src/rules/style.rs
+++ b/src/rules/style.rs
@@ -75,7 +75,9 @@ impl<'i, T: Clone> StyleRule<'i, T> {
     if context.pure_css_modules {
       if !self.selectors.0.iter().all(is_pure_css_modules_selector) {
         return Err(MinifyError {
-          kind: crate::error::MinifyErrorKind::ImpureCSSModuleSelector,
+          kind: crate::error::MinifyErrorKind::ImpureCSSModuleSelector {
+            selector: self.selectors.to_string(),
+          },
           loc: self.loc,
         });
       }