diff --git a/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractRestrictBackgroundNetworkTestCase.java b/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractRestrictBackgroundNetworkTestCase.java
index 4e4d1f6075..bff02db038 100644
--- a/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractRestrictBackgroundNetworkTestCase.java
+++ b/tests/cts/hostside/app/src/com/android/cts/net/hostside/AbstractRestrictBackgroundNetworkTestCase.java
@@ -153,7 +153,14 @@ abstract class AbstractRestrictBackgroundNetworkTestCase extends Instrumentation
         Log.i(TAG, "Apps status on " + getName() + ":\n"
                 + "\ttest app: uid=" + mMyUid + ", state=" + getProcessStateByUid(mMyUid) + "\n"
                 + "\tapp2: uid=" + mUid + ", state=" + getProcessStateByUid(mUid));
-        executeShellCommand("settings get global app_idle_constants");
+
+        // app_idle_constants set in NetPolicyTestsPreparer.setUp() is not always sucessful (suspect
+        // timing issue), here we set it again to make sure.
+        final String appIdleConstants = "parole_duration=0,stable_charging_threshold=0";
+        executeShellCommand("settings put global app_idle_constants " + appIdleConstants);
+        final String currentConstants =
+                executeShellCommand("settings get global app_idle_constants");
+        assertEquals(appIdleConstants, currentConstants);
    }
 
     @Override
diff --git a/tests/cts/hostside/src/com/android/cts/net/NetPolicyTestsPreparer.java b/tests/cts/hostside/src/com/android/cts/net/NetPolicyTestsPreparer.java
index ca14c27c20..bc2ee2cf7a 100644
--- a/tests/cts/hostside/src/com/android/cts/net/NetPolicyTestsPreparer.java
+++ b/tests/cts/hostside/src/com/android/cts/net/NetPolicyTestsPreparer.java
@@ -48,7 +48,7 @@ public class NetPolicyTestsPreparer implements ITargetPreparer, ITargetCleaner {
     }
 
     private void setAppIdleConstants(String appIdleConstants) throws DeviceNotAvailableException {
-        executeCmd("settings put global app_idle_constants " + appIdleConstants);
+        executeCmd("settings put global app_idle_constants \"" + appIdleConstants + "\"");
     }
 
     private String getAppIdleConstants() throws DeviceNotAvailableException {