diff --git a/src/mesa/main/attrib.c b/src/mesa/main/attrib.c
index 9c7f5ed..ada2203 100644
--- a/src/mesa/main/attrib.c
+++ b/src/mesa/main/attrib.c
@@ -1071,7 +1071,8 @@
                if (ctx->Extensions.ARB_color_buffer_float)
                   _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
                                    color->ClampFragmentColor);
-               _mesa_ClampColor(GL_CLAMP_READ_COLOR_ARB, color->ClampReadColor);
+               if (ctx->Extensions.ARB_color_buffer_float || ctx->Version >= 30)
+                  _mesa_ClampColor(GL_CLAMP_READ_COLOR_ARB, color->ClampReadColor);
 
                /* GL_ARB_framebuffer_sRGB / GL_EXT_framebuffer_sRGB */
                if (ctx->Extensions.EXT_framebuffer_sRGB)