diff --git a/src/osg/Texture.cpp b/src/osg/Texture.cpp
index 8b17c45e1..c4905da25 100644
--- a/src/osg/Texture.cpp
+++ b/src/osg/Texture.cpp
@@ -487,7 +487,7 @@ void Texture::applyTexParameters(GLenum target, State& state) const
       {
         if (_use_shadow_comparison)
           {
-            glTexParameteri(target, GL_TEXTURE_COMPARE_MODE_ARB, GL_COMPARE_R_TO_TEXTURE);
+            glTexParameteri(target, GL_TEXTURE_COMPARE_MODE_ARB, GL_COMPARE_R_TO_TEXTURE_ARB);
             glTexParameteri(target, GL_TEXTURE_COMPARE_FUNC_ARB, _shadow_compare_func);
             glTexParameteri(target, GL_DEPTH_TEXTURE_MODE_ARB, _shadow_texture_mode);
           }