--- a/mobile/app/mobile.js
+++ b/mobile/app/mobile.js
@@ -313,17 +313,17 @@ pref("browser.geolocation.warning.infoUR
 
 // base url for the wifi geolocation network provider
 pref("geo.wifi.uri", "https://www.google.com/loc/json");
 
 // enable geo
 pref("geo.enabled", true);
 
 #ifdef WINCE
-pref("layout.css.devPixelsPerPx", "1");
+pref("layout.css.devPixelsPerPx", 1);
 #endif
 
 // content sink control -- controls responsiveness during page load
 pref("content.max.deflected.tokens", 10);
 pref("content.max.tokenizing.time", 50000);
 
 pref("javascript.options.jit.content", true);
 pref("javascript.options.jit.chrome", true);