diff --git a/lib/util/devutil.js b/lib/util/devutil.js
index de51022e..6eb128d9 100644
--- a/lib/util/devutil.js
+++ b/lib/util/devutil.js
@@ -50,7 +50,7 @@ devutil.listPidsByComm = function(adb, serial, comm, bin) {
           }
           else {
             var cols = chunk.toString().split(/\s+/)
-            if (cols.pop() === bin && users[cols[0]]) {
+            if (cols.pop() === comm && users[cols[0]]) {
               pids.push(Number(cols[1]))
             }
           }
@@ -61,14 +61,14 @@ devutil.listPidsByComm = function(adb, serial, comm, bin) {
     })
   }
 
-  return adb.shell(serial, 'ps')
+  return adb.shell(serial, 'ps 2>/dev/null')
      .then(findProcess)
      .then(function(pids) {
        if (pids.length > 0) { // return pids if process can be found in the output of 'ps' command
          return Promise.resolve(pids)
        }
        else {                 // otherwise try to run 'ps -elf'
-         return adb.shell(serial, 'ps -lef')
+         return adb.shell(serial, 'ps -lef 2>/dev/null')
            .then(findProcess)
        }
      })