--- a/servo/ports/geckolib/glue.rs
+++ b/servo/ports/geckolib/glue.rs
@@ -751,19 +751,24 @@ macro_rules! impl_basic_rule_funcs {
         to_css: $to_css:ident,
     } => {
         #[no_mangle]
         pub extern "C" fn $getter(rules: ServoCssRulesBorrowed, index: u32, line: *mut u32, column: *mut u32)
             -> Strong<$raw_type> {
             read_locked_arc(rules, |rules: &CssRules| {
                 match rules.0[index as usize] {
                     CssRule::$name(ref rule) => {
-                        unsafe {
-                            *line = 0; // TODO rule.source_location.line as u32
-                            *column = 0; // TODO rule.source_location.column as u32
+                        {
+                            let global_style_data = &*GLOBAL_STYLE_DATA;
+                            let guard = global_style_data.shared_lock.read();
+                            let rule = rule.read_with(&guard);
+                            unsafe {
+                                *line = rule.source_location.line as u32;
+                                *column = rule.source_location.column as u32;
+                            }
                         }
                         rule.clone().into_strong()
                     },
                     _ => {
                         unreachable!(concat!(stringify!($getter), "should only be called ",
                                              "on a ", stringify!($name), " rule"));
                     }
                 }