diff --git a/mozilla/gfx/src/gtk/nsDeviceContextGTK.cpp b/mozilla/gfx/src/gtk/nsDeviceContextGTK.cpp
index 83cf6c9e22c..19232a88034 100644
--- a/mozilla/gfx/src/gtk/nsDeviceContextGTK.cpp
+++ b/mozilla/gfx/src/gtk/nsDeviceContextGTK.cpp
@@ -92,6 +92,7 @@ NS_IMETHODIMP nsDeviceContextGTK::Init(nsNativeWidget aNativeWidget)
           dpi = nscoord(screenWidth / screenWidthIn);
         }
       }
+      nsServiceManager::ReleaseService(kPrefCID, prefs);
     }
   }