diff --git a/components/style/properties/longhands/effects.mako.rs b/components/style/properties/longhands/effects.mako.rs
index 1860f4b1791..7a33a36babc 100644
--- a/components/style/properties/longhands/effects.mako.rs
+++ b/components/style/properties/longhands/effects.mako.rs
@@ -78,7 +78,7 @@ ${helpers.single_keyword(
     "mix-blend-mode",
     """normal multiply screen overlay darken lighten color-dodge
     color-burn hard-light soft-light difference exclusion hue
-    saturation color luminosity plus-lighter""",
+    saturation color luminosity""" + ("plus-lighter" if engine == 'gecko' else ""),
     engines="gecko servo-2013 servo-2020",
     gecko_enum_prefix="StyleBlend",
     animation_value_type="discrete",