diff --git a/src/jni/rtp/AudioGroup.cpp b/src/jni/rtp/AudioGroup.cpp
index 55c6081..0204e21 100644
--- a/src/jni/rtp/AudioGroup.cpp
+++ b/src/jni/rtp/AudioGroup.cpp
@@ -473,7 +473,7 @@
 class AudioGroup
 {
 public:
-    AudioGroup(const String16 &opPackageName);
+    explicit AudioGroup(const String16 &opPackageName);
     ~AudioGroup();
     bool set(int sampleRate, int sampleCount);
 
@@ -509,7 +509,7 @@
     class NetworkThread : public Thread
     {
     public:
-        NetworkThread(AudioGroup *group) : Thread(false), mGroup(group) {}
+        explicit NetworkThread(AudioGroup *group) : Thread(false), mGroup(group) {}
 
         bool start()
         {
@@ -529,7 +529,7 @@
     class DeviceThread : public Thread
     {
     public:
-        DeviceThread(AudioGroup *group) : Thread(false), mGroup(group) {}
+        explicit DeviceThread(AudioGroup *group) : Thread(false), mGroup(group) {}
 
         bool start()
         {