diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 9ec7ee3cf76..6f59864b322 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -694,7 +694,7 @@ impl<'le> PresentationalHintsSynthetizer for GeckoElement<'le> {
             let global_style_data = &*GLOBAL_STYLE_DATA;
 
             let pdb = PropertyDeclarationBlock::with_one(
-                PropertyDeclaration::XLang(SpecifiedLang(Atom::from(ptr))),
+                PropertyDeclaration::XLang(SpecifiedLang(unsafe { Atom::from_addrefed(ptr) })),
                 Importance::Normal
             );
             let arc = Arc::new(global_style_data.shared_lock.wrap(pdb));
diff --git a/components/style/gecko_string_cache/mod.rs b/components/style/gecko_string_cache/mod.rs
index b464d459a0e..b6659c6ab91 100644
--- a/components/style/gecko_string_cache/mod.rs
+++ b/components/style/gecko_string_cache/mod.rs
@@ -197,6 +197,16 @@ impl Atom {
                       "Called from_static for a non-static atom!");
         atom
     }
+
+    /// Creates an atom from a dynamic atom pointer that has already had AddRef
+    /// called on it.
+    #[inline]
+    pub unsafe fn from_addrefed(ptr: *mut nsIAtom) -> Self {
+        debug_assert!(!ptr.is_null());
+        unsafe {
+            Atom(WeakAtom::new(ptr))
+        }
+    }
 }
 
 impl Hash for Atom {