diff --git a/source/src/rendercubes.cpp b/source/src/rendercubes.cpp
index 5f86dde8..db89e2bd 100644
--- a/source/src/rendercubes.cpp
+++ b/source/src/rendercubes.cpp
@@ -438,14 +438,14 @@ void setprojtexmatrix()
 
 void setupmultitexrefract(GLuint reflecttex, GLuint refracttex)
 {
-    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_CONSTANT_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_CONSTANT_ARB);
-    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_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_CONSTANT_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_CONSTANT_EXT);
+    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_EXT, GL_SRC_ALPHA);
     
     float wc[4] = { hdr.watercolor[0]/255.0f, hdr.watercolor[1]/255.0f, hdr.watercolor[2]/255.0f, hdr.watercolor[3]/255.0f };
     glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, wc);