diff --git a/ports/geckolib/properties.mako.rs b/ports/geckolib/properties.mako.rs
index 4622c9639be..55a9a528bbd 100644
--- a/ports/geckolib/properties.mako.rs
+++ b/ports/geckolib/properties.mako.rs
@@ -666,7 +666,7 @@ fn static_assert() {
         match v {
             % for value in keyword.values_for('gecko'):
                 T::${to_rust_ident(value)} =>
-                    self.gecko.mVerticalAlign.set_int(structs::${keyword.gecko_constant(value)} as i32),
+                    self.gecko.mVerticalAlign.set_enum(structs::${keyword.gecko_constant(value)} as i32),
             % endfor
             T::LengthOrPercentage(v) => self.gecko.mVerticalAlign.set(v),
         }
diff --git a/ports/geckolib/values.rs b/ports/geckolib/values.rs
index 7a313315f1f..c2d227970ee 100644
--- a/ports/geckolib/values.rs
+++ b/ports/geckolib/values.rs
@@ -13,6 +13,7 @@ pub trait StyleCoordHelpers {
     fn set_auto(&mut self);
     fn set_coord(&mut self, val: Au);
     fn set_int(&mut self, val: i32);
+    fn set_enum(&mut self, val: i32);
     fn set_percent(&mut self, val: f32);
 }
 
@@ -40,6 +41,11 @@ impl StyleCoordHelpers for nsStyleCoord {
         self.mUnit = nsStyleUnit::eStyleUnit_Integer;
         unsafe { *self.mValue.mInt.as_mut() = val; }
     }
+
+    fn set_enum(&mut self, val: i32) {
+        self.mUnit = nsStyleUnit::eStyleUnit_Enumerated;
+        unsafe { *self.mValue.mInt.as_mut() = val; }
+    }
 }
 
 pub trait ToGeckoStyleCoord {