diff --git a/components/fx/technique.hpp b/components/fx/technique.hpp
index 0d17128e56..fa66996aeb 100644
--- a/components/fx/technique.hpp
+++ b/components/fx/technique.hpp
@@ -55,7 +55,7 @@ namespace fx
             osg::ref_ptr<osg::Texture2D> mRenderTexture;
             bool mResolve = false;
             Types::SizeProxy mSize;
-            bool mMipMap;
+            bool mMipMap = false;
 
             SubPass(const SubPass& other, const osg::CopyOp& copyOp = osg::CopyOp::SHALLOW_COPY)
                 : mStateSet(new osg::StateSet(*other.mStateSet, copyOp))