diff --git a/libs/gui/tests/SurfaceTextureClient_test.cpp b/libs/gui/tests/SurfaceTextureClient_test.cpp
index 1a50b24..2e56419 100644
--- a/libs/gui/tests/SurfaceTextureClient_test.cpp
+++ b/libs/gui/tests/SurfaceTextureClient_test.cpp
@@ -519,7 +519,7 @@
             return false;
         }
     public:
-        MyThread(const sp<GLConsumer>& mST)
+        explicit MyThread(const sp<GLConsumer>& mST)
             : mST(mST), mBufferRetired(false) {
             ctx = eglGetCurrentContext();
             sur = eglGetCurrentSurface(EGL_DRAW);
diff --git a/libs/gui/tests/SurfaceTextureGL_test.cpp b/libs/gui/tests/SurfaceTextureGL_test.cpp
index fad133f..bf87061 100644
--- a/libs/gui/tests/SurfaceTextureGL_test.cpp
+++ b/libs/gui/tests/SurfaceTextureGL_test.cpp
@@ -426,7 +426,7 @@
 
     class ProducerThread : public Thread {
     public:
-        ProducerThread(const sp<ANativeWindow>& anw):
+        explicit ProducerThread(const sp<ANativeWindow>& anw):
                 mANW(anw) {
         }
 
@@ -603,7 +603,7 @@
 TEST_F(SurfaceTextureGLTest, AbandonUnblocksDequeueBuffer) {
     class ProducerThread : public Thread {
     public:
-        ProducerThread(const sp<ANativeWindow>& anw):
+        explicit ProducerThread(const sp<ANativeWindow>& anw):
                 mANW(anw),
                 mDequeueError(NO_ERROR) {
         }