diff --git a/services/audioflinger/AutoPark.h b/services/audioflinger/AutoPark.h
index e539e47..9ac7b65 100644
--- a/services/audioflinger/AutoPark.h
+++ b/services/audioflinger/AutoPark.h
@@ -21,7 +21,7 @@
 public:
 
     // Park the specific FastThread, which can be nullptr, in hot idle if not currently idling
-    AutoPark(const sp<T>& fastThread) : mFastThread(fastThread)
+    explicit AutoPark(const sp<T>& fastThread) : mFastThread(fastThread)
     {
         mPreviousCommand = FastThreadState::HOT_IDLE;
         if (fastThread != nullptr) {
diff --git a/services/audioflinger/LinearMap.h b/services/audioflinger/LinearMap.h
index fca14dd..2220a0c 100644
--- a/services/audioflinger/LinearMap.h
+++ b/services/audioflinger/LinearMap.h
@@ -134,7 +134,7 @@
         FIND_METHOD_START_VALUE,             // No samples in history, using start value
     };
 
-    LinearMap(size_t size)
+    explicit LinearMap(size_t size)
             : mSize(size),
               mPos(0), // a circular buffer, so could start anywhere. the first sample is at 1.
               mSamples(0),
diff --git a/services/audiopolicy/common/managerdefinitions/include/AudioRoute.h b/services/audiopolicy/common/managerdefinitions/include/AudioRoute.h
index 67e197f..df54f48 100644
--- a/services/audiopolicy/common/managerdefinitions/include/AudioRoute.h
+++ b/services/audiopolicy/common/managerdefinitions/include/AudioRoute.h
@@ -36,7 +36,7 @@
 class AudioRoute  : public virtual RefBase
 {
 public:
-    AudioRoute(audio_route_type_t type) : mType(type) {}
+    explicit AudioRoute(audio_route_type_t type) : mType(type) {}
 
     void setSources(const AudioPortVector &sources) { mSources = sources; }
     const AudioPortVector &getSources() const { return mSources; }
diff --git a/services/audiopolicy/common/managerdefinitions/include/IOProfile.h b/services/audiopolicy/common/managerdefinitions/include/IOProfile.h
index e3ad44d..ec04ef7 100644
--- a/services/audiopolicy/common/managerdefinitions/include/IOProfile.h
+++ b/services/audiopolicy/common/managerdefinitions/include/IOProfile.h
@@ -110,13 +110,13 @@
 class InputProfile : public IOProfile
 {
 public:
-    InputProfile(const String8 &name) : IOProfile(name, AUDIO_PORT_ROLE_SINK) {}
+    explicit InputProfile(const String8 &name) : IOProfile(name, AUDIO_PORT_ROLE_SINK) {}
 };
 
 class OutputProfile : public IOProfile
 {
 public:
-    OutputProfile(const String8 &name) : IOProfile(name, AUDIO_PORT_ROLE_SOURCE) {}
+    explicit OutputProfile(const String8 &name) : IOProfile(name, AUDIO_PORT_ROLE_SOURCE) {}
 };
 
 }; // namespace android