diff --git a/opengl/libs/EGL/eglApi.cpp b/opengl/libs/EGL/eglApi.cpp
index d3bc14a..04d5f45 100644
--- a/opengl/libs/EGL/eglApi.cpp
+++ b/opengl/libs/EGL/eglApi.cpp
@@ -49,6 +49,10 @@
 
 using namespace android;
 
+// This extension has not been ratified yet, so can't be shipped.
+// Implementation is incomplete and untested.
+#define ENABLE_EGL_KHR_GL_COLORSPACE 0
+
 // ----------------------------------------------------------------------------
 
 namespace android {
@@ -82,7 +86,9 @@
         "EGL_KHR_image_base "                   // mandatory
         "EGL_KHR_image_pixmap "
         "EGL_KHR_lock_surface "
+#if (ENABLE_EGL_KHR_GL_COLORSPACE != 0)
         "EGL_KHR_gl_colorspace "
+#endif
         "EGL_KHR_gl_texture_2D_image "
         "EGL_KHR_gl_texture_cubemap_image "
         "EGL_KHR_gl_renderbuffer_image "
@@ -366,7 +372,7 @@
 // surfaces
 // ----------------------------------------------------------------------------
 
-// The EGL_KHR_gl_colorspace spec hasn't been published yet, so these haven't
+// The EGL_KHR_gl_colorspace spec hasn't been ratified yet, so these haven't
 // been added to the Khronos egl.h.
 #define EGL_GL_COLORSPACE_KHR           EGL_VG_COLORSPACE
 #define EGL_GL_COLORSPACE_SRGB_KHR      EGL_VG_COLORSPACE_sRGB
@@ -427,7 +433,17 @@
                     attr += 2) {
                 if (*attr == EGL_GL_COLORSPACE_KHR &&
                         dp->haveExtension("EGL_KHR_gl_colorspace")) {
-                    format = modifyFormatColorspace(format, *(attr+1));
+                    if (ENABLE_EGL_KHR_GL_COLORSPACE) {
+                        format = modifyFormatColorspace(format, *(attr+1));
+                    } else {
+                        // Normally we'd pass through unhandled attributes to
+                        // the driver. But in case the driver implements this
+                        // extension but we're disabling it, we want to prevent
+                        // it getting through -- support will be broken without
+                        // our help.
+                        ALOGE("sRGB window surfaces not supported");
+                        return setError(EGL_BAD_ATTRIBUTE, EGL_NO_SURFACE);
+                    }
                 }
             }
         }
@@ -458,7 +474,17 @@
         if (attrib_list && dp->haveExtension("EGL_KHR_gl_colorspace")) {
             for (const EGLint* attr = attrib_list; *attr != EGL_NONE; attr += 2) {
                 if (*attr == EGL_GL_COLORSPACE_KHR) {
-                    format = modifyFormatColorspace(format, attr[1]);
+                    if (ENABLE_EGL_KHR_GL_COLORSPACE) {
+                        format = modifyFormatColorspace(format, *(attr+1));
+                    } else {
+                        // Normally we'd pass through unhandled attributes to
+                        // the driver. But in case the driver implements this
+                        // extension but we're disabling it, we want to prevent
+                        // it getting through -- support will be broken without
+                        // our help.
+                        ALOGE("sRGB window surfaces not supported");
+                        return setError(EGL_BAD_ATTRIBUTE, EGL_NO_SURFACE);
+                    }
                 }
             }
         }