diff --git a/modules/contrib/prime.py b/modules/contrib/prime.py
index 542ae20..f9bb0e7 100644
--- a/modules/contrib/prime.py
+++ b/modules/contrib/prime.py
@@ -17,8 +17,8 @@ Then put a line like this in there:
 If you can't figure out the sudoers thing, then don't worry, it's still really useful.
 
 Parameters:
-    * prime.nvidiastring: String to use when nvidia is selected (defaults to "intel")
-    * prime.intelstring: String to use when intel is selected (defaults to "intel")
+    * prime.nvidiastring: String to use when nvidia is selected (defaults to 'intel')
+    * prime.intelstring: String to use when intel is selected (defaults to 'intel')
 
 Requires the following executable:
     * prime-select
@@ -40,30 +40,30 @@ class Module(bumblebee.engine.Module):
         engine.input.register_callback(self, button=bumblebee.input.RIGHT_MOUSE,
             cmd=self._chooseIntel)
 
-        self.nvidiastring = self.parameter("nvidiastring", "nv")
-        self.intelstring = self.parameter("intelstring", "it")
+        self.nvidiastring = self.parameter('nvidiastring', 'nv')
+        self.intelstring = self.parameter('intelstring', 'it')
 
     def _chooseNvidia(self, event):
-        bumblebee.util.execute("sudo prime-select nvidia")
+        bumblebee.util.execute('sudo prime-select nvidia')
 
     def _chooseIntel(self, event):
-        bumblebee.util.execute("sudo prime-select intel")
+        bumblebee.util.execute('sudo prime-select intel')
 
     def _prev_keymap(self, event):
         self._set_keymap(-1)
 
     def query(self, widget):
         try:
-            res = bumblebee.util.execute("prime-select query")
+            res = bumblebee.util.execute('prime-select query')
         except RuntimeError:
-            return "n/a"
+            return 'n/a'
 
-        for line in res.split("\n"):
+        for line in res.split('\n'):
             if not line: continue
-            if "nvidia" in line:
+            if 'nvidia' in line:
                 return self.nvidiastring
-            if "intel" in line:
+            if 'intel' in line:
                 return self.intelstring
-        return "n/a"
+        return 'n/a'
 
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