diff --git a/src/gui/opengl/qopengltextureglyphcache.cpp b/src/gui/opengl/qopengltextureglyphcache.cpp
index ffce6f55bb..bfeef5a685 100644
--- a/src/gui/opengl/qopengltextureglyphcache.cpp
+++ b/src/gui/opengl/qopengltextureglyphcache.cpp
@@ -53,6 +53,7 @@ QBasicAtomicInt qopengltextureglyphcache_serial_number = Q_BASIC_ATOMIC_INITIALI
 
 QOpenGLTextureGlyphCache::QOpenGLTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix)
     : QImageTextureGlyphCache(type, matrix)
+    , m_textureResource(0)
     , pex(0)
     , m_blitProgram(0)
     , m_filterMode(Nearest)