diff --git a/gfx/layers/opengl/TextureClientOGL.cpp b/gfx/layers/opengl/TextureClientOGL.cpp
index 247d39b83b2..c61897494ea 100644
--- a/gfx/layers/opengl/TextureClientOGL.cpp
+++ b/gfx/layers/opengl/TextureClientOGL.cpp
@@ -21,6 +21,7 @@ SharedTextureClientOGL::SharedTextureClientOGL(TextureFlags aFlags)
   : TextureClient(aFlags)
   , mHandle(0)
   , mInverted(false)
+  , mIsLocked(false)
 {
   // SharedTextureClient is always owned externally.
   mFlags |= TextureFlags::DEALLOCATE_CLIENT;