diff --git a/source/src/rendercubes.cpp b/source/src/rendercubes.cpp
index db89e2bd..d89be2f8 100644
--- a/source/src/rendercubes.cpp
+++ b/source/src/rendercubes.cpp
@@ -455,14 +455,14 @@ void setupmultitexrefract(GLuint reflecttex, GLuint refracttex)
     glActiveTexture_(GL_TEXTURE1_ARB);
     glEnable(GL_TEXTURE_2D);
 
-    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
-    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB,  GL_INTERPOLATE_ARB);
-    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB,  GL_PREVIOUS_ARB);
-    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
-    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB,  GL_TEXTURE);
-    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
-    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB,  GL_PRIMARY_COLOR_ARB);
-    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_ONE_MINUS_SRC_ALPHA);
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
+    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT,  GL_INTERPOLATE_EXT);
+    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_EXT,  GL_PREVIOUS_EXT);
+    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_EXT, GL_SRC_COLOR);
+    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_EXT,  GL_TEXTURE);
+    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_EXT, GL_SRC_COLOR);
+    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_EXT,  GL_PRIMARY_COLOR_EXT);
+    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_EXT, GL_ONE_MINUS_SRC_ALPHA);
    
     glBindTexture(GL_TEXTURE_2D, reflecttex);
     setprojtexmatrix();