diff --git a/opengl/tests/hwc/hwcCommit.cpp b/opengl/tests/hwc/hwcCommit.cpp
index 1bcb860..5d7f810 100644
--- a/opengl/tests/hwc/hwcCommit.cpp
+++ b/opengl/tests/hwc/hwcCommit.cpp
@@ -162,7 +162,7 @@
 // Local types
 class Rectangle {
 public:
-    Rectangle(uint32_t graphicFormat = defaultFormat,
+    explicit Rectangle(uint32_t graphicFormat = defaultFormat,
               HwcTestDim dfDim = HwcTestDim(1, 1),
               HwcTestDim sDim = HwcTestDim(1, 1));
     void setSourceDim(HwcTestDim dim);
diff --git a/services/batteryservice/IBatteryPropertiesListener.cpp b/services/batteryservice/IBatteryPropertiesListener.cpp
index 8aff26c..7555f4b 100644
--- a/services/batteryservice/IBatteryPropertiesListener.cpp
+++ b/services/batteryservice/IBatteryPropertiesListener.cpp
@@ -24,7 +24,7 @@
 class BpBatteryPropertiesListener : public BpInterface<IBatteryPropertiesListener>
 {
 public:
-    BpBatteryPropertiesListener(const sp<IBinder>& impl)
+    explicit BpBatteryPropertiesListener(const sp<IBinder>& impl)
         : BpInterface<IBatteryPropertiesListener>(impl)
     {
     }
diff --git a/services/batteryservice/IBatteryPropertiesRegistrar.cpp b/services/batteryservice/IBatteryPropertiesRegistrar.cpp
index 46934e0..1fdda43 100644
--- a/services/batteryservice/IBatteryPropertiesRegistrar.cpp
+++ b/services/batteryservice/IBatteryPropertiesRegistrar.cpp
@@ -28,7 +28,7 @@
 
 class BpBatteryPropertiesRegistrar : public BpInterface<IBatteryPropertiesRegistrar> {
 public:
-    BpBatteryPropertiesRegistrar(const sp<IBinder>& impl)
+    explicit BpBatteryPropertiesRegistrar(const sp<IBinder>& impl)
         : BpInterface<IBatteryPropertiesRegistrar>(impl) {}
 
         void registerListener(const sp<IBatteryPropertiesListener>& listener) {
diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index a7fe69c..f12320d 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -325,7 +325,7 @@
         KeyedVector<int32_t, bool> leds;
         Vector<VirtualKeyDefinition> virtualKeys;
 
-        Device(uint32_t classes) :
+        explicit Device(uint32_t classes) :
                 classes(classes) {
         }
     };
diff --git a/services/powermanager/IPowerManager.cpp b/services/powermanager/IPowerManager.cpp
index bff8719..ea3a831 100644
--- a/services/powermanager/IPowerManager.cpp
+++ b/services/powermanager/IPowerManager.cpp
@@ -30,7 +30,7 @@
 class BpPowerManager : public BpInterface<IPowerManager>
 {
 public:
-    BpPowerManager(const sp<IBinder>& impl)
+    explicit BpPowerManager(const sp<IBinder>& impl)
         : BpInterface<IPowerManager>(impl)
     {
     }