diff --git a/components/style/values/specified/length.rs b/components/style/values/specified/length.rs
index c4da56cf600..4a5f213d976 100644
--- a/components/style/values/specified/length.rs
+++ b/components/style/values/specified/length.rs
@@ -132,7 +132,7 @@ impl FontRelativeLength {
 
         match *self {
             FontRelativeLength::Em(length) => {
-                if !matches!(base_size, FontBaseSize::InheritedStyle) {
+                if matches!(base_size, FontBaseSize::CurrentStyle) {
                     context.rule_cache_conditions.borrow_mut()
                         .set_font_size_dependency(
                             reference_font_size.into()