diff --git a/lib/util/devutil.js b/lib/util/devutil.js
index 96859616..942b1c13 100644
--- a/lib/util/devutil.js
+++ b/lib/util/devutil.js
@@ -5,8 +5,6 @@ var Promise = require('bluebird')
 
 var devutil = module.exports = Object.create(null)
 
-var commands = Object.create(null)
-
 function closedError(err) {
   return err.message.indexOf('closed') !== -1
 }
@@ -41,48 +39,28 @@ devutil.listPidsByComm = function(adb, serial, comm, bin) {
     shell: true
   }
 
-  return new Promise(function(resolve) {
-    if ('ps' in commands) {
-      resolve(commands)
-    }
-    else {
-      adb.getProperties(serial)
-        .then(function(properties) {
-          var version = properties['ro.build.version.release']
-          if (version.match(/^8\./) !== null) {
-            commands.ps = 'ps -lef'
-          }
-          else {
-            commands.ps = 'ps'
-          }
-          resolve(commands)
-        })
-    }
-  })
-  .then(function(commands) {
-     return adb.shell(serial, [commands.ps])
-            .then(function(out) {
-              return new Promise(function(resolve) {
-                var header = true
-                var pids = []
-                out.pipe(split())
-                  .on('data', function(chunk) {
-                    if (header) {
-                      header = false
+  return adb.shell(serial, 'ps -lef||ps')
+         .then(function(out) {
+            return new Promise(function(resolve) {
+              var header = true
+              var pids = []
+              out.pipe(split())
+                .on('data', function(chunk) {
+                  if (header&&chunk.toString().indexOf('bad pid') === -1) {
+                    header = false
+                  }
+                  else {
+                    var cols = chunk.toString().split(/\s+/)
+                    if (cols.pop() === bin && users[cols[0]]) {
+                      pids.push(Number(cols[1]))
                     }
-                    else {
-                      var cols = chunk.toString().split(/\s+/)
-                      if (cols.pop() === bin && users[cols[0]]) {
-                        pids.push(Number(cols[1]))
-                      }
-                    }
-                  })
-                  .on('end', function() {
-                    resolve(pids)
-                  })
-              })
+                  }
+                })
+                .on('end', function() {
+                  resolve(pids)
+                })
             })
-  })
+         })
 }
 
 devutil.waitForProcsToDie = function(adb, serial, comm, bin) {