diff --git a/DepthPeeling.cc b/DepthPeeling.cc
index 835740db05ce6226a3fc705877812c90d22d0cc3..92eeba4f464ac9016c0aa754339a1d91ce9ea78d 100644
--- a/DepthPeeling.cc
+++ b/DepthPeeling.cc
@@ -743,7 +743,7 @@ void DepthPeeling::renderDualPeeling(ACG::GLState* _glState, Viewer::ViewerPrope
       // blend back color into accumulation buffer
       glDrawBuffer(colorBlendTarget);
 
-      glBlendEquationEXT(GL_FUNC_ADD);
+      glBlendEquation(GL_FUNC_ADD);
       ACG::GLState::blendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
       // bind back color texture to slot 0