diff --git a/media/mca/filterfw/native/core/gl_frame.h b/media/mca/filterfw/native/core/gl_frame.h
index f2a1ad5ed81bd..fdbb1f57009ac 100644
--- a/media/mca/filterfw/native/core/gl_frame.h
+++ b/media/mca/filterfw/native/core/gl_frame.h
@@ -38,7 +38,7 @@ class GLFrame : public GLBufferHandle {
     // Create an empty GL frame in the specified GL environment. Note, that the GLFrame does NOT
     // take ownership. The caller must make sure the GLEnv stays valid as long as the GLFrame is
     // alive.
-    GLFrame(GLEnv* gl_env);
+    explicit GLFrame(GLEnv* gl_env);
 
     // Deallocate a GL frame.
     ~GLFrame();
diff --git a/media/mca/filterfw/native/core/native_frame.h b/media/mca/filterfw/native/core/native_frame.h
index 0d335b36a26b5..2da557dec000c 100644
--- a/media/mca/filterfw/native/core/native_frame.h
+++ b/media/mca/filterfw/native/core/native_frame.h
@@ -27,7 +27,7 @@ namespace filterfw {
 class NativeFrame {
   public:
     // Create an empty native frame.
-    NativeFrame(int size);
+    explicit NativeFrame(int size);
 
     ~NativeFrame();