diff --git a/libs/surfaceflinger_client/Surface.cpp b/libs/surfaceflinger_client/Surface.cpp
index d44aab9..854a3c6 100644
--- a/libs/surfaceflinger_client/Surface.cpp
+++ b/libs/surfaceflinger_client/Surface.cpp
@@ -866,7 +866,18 @@
         return BAD_VALUE;
 
     Mutex::Autolock _l(mSurfaceLock);
+    if (mConnected == NATIVE_WINDOW_API_EGL) {
+        return INVALID_OPERATION;
+    }
+
     mBufferInfo.set(w, h, format);
+    if (format != 0) {
+        // we update the format of the surface as reported by query().
+        // this is to allow applications to change the format of a surface's
+        // buffer, and have it reflected in EGL; which is needed for
+        // EGLConfig validation.
+        mFormat = format;
+    }
     return NO_ERROR;
 }