diff --git a/progs/tests/fbotest1.c b/progs/tests/fbotest1.c
index 0cd7f95c355..a95fdff74c3 100644
--- a/progs/tests/fbotest1.c
+++ b/progs/tests/fbotest1.c
@@ -36,8 +36,8 @@ Display( void )
 
    /* draw to user framebuffer */
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
-   glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
-   glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
+   glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
+   glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
 
    status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
@@ -161,7 +161,7 @@ Init( void )
    assert(i == MyFB);
 
    CheckError(__LINE__);
-   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
                                 GL_RENDERBUFFER_EXT, MyRB);
 
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
diff --git a/progs/tests/fbotest2.c b/progs/tests/fbotest2.c
index f9c506193f6..872b46279e6 100644
--- a/progs/tests/fbotest2.c
+++ b/progs/tests/fbotest2.c
@@ -40,8 +40,8 @@ Display( void )
 
    /* draw to user framebuffer */
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
-   glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
-   glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
+   glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
+   glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
 
    status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
@@ -163,7 +163,7 @@ Init( void )
    glGenRenderbuffersEXT(1, &ColorRb);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb);
    assert(glIsRenderbufferEXT(ColorRb));
-   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
                                 GL_RENDERBUFFER_EXT, ColorRb);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
 
diff --git a/progs/tests/fbotest3.c b/progs/tests/fbotest3.c
index 8e288b38b83..c176f82d2ba 100644
--- a/progs/tests/fbotest3.c
+++ b/progs/tests/fbotest3.c
@@ -50,8 +50,8 @@ Display( void )
 
    /* draw to user framebuffer */
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
-   glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
-   glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
+   glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
+   glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
 
    status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
@@ -189,7 +189,7 @@ Init( void )
    glGenRenderbuffersEXT(1, &ColorRb);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb);
    assert(glIsRenderbufferEXT(ColorRb));
-   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
                                 GL_RENDERBUFFER_EXT, ColorRb);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);