diff --git a/src/opengl/qglextensions.cpp b/src/opengl/qglextensions.cpp
index 98d2960..bb3f63b 100644
--- a/src/opengl/qglextensions.cpp
+++ b/src/opengl/qglextensions.cpp
@@ -206,8 +206,17 @@ bool qt_resolve_buffer_extensions(QGLContext *ctx)
     glGetBufferSubData = (_glGetBufferSubData) qt_gl_getProcAddressARB(ctx, "glGetBufferSubData");
     glGetBufferParameteriv = (_glGetBufferParameteriv) qt_gl_getProcAddressARB(ctx, "glGetBufferParameteriv");
 #endif
-    glMapBufferARB = (_glMapBufferARB) qt_gl_getProcAddressARB(ctx, "glMapBuffer");
+
+#ifdef QT_OPENGL_ES_2
+    static bool gl_oes_mapbuffer_available = QGLExtensionMatcher().match("GL_OES_mapbuffer");
+    if(gl_oes_mapbuffer_available) {
+        glMapBufferARB = (_glMapBufferARB) qt_gl_getProcAddressARB(ctx, "glMapBufferOES");
+        glUnmapBufferARB = (_glUnmapBufferARB) qt_gl_getProcAddressARB(ctx, "glUnmapBufferOES");
+    }
+#else
+    glMapBufferARB = (_glMapBufferARB) qt_gl_getProcAddressARB(ctx, "glMapBufferOES");
     glUnmapBufferARB = (_glUnmapBufferARB) qt_gl_getProcAddressARB(ctx, "glUnmapBuffer");
+#endif

 #if defined(QGL_RESOLVE_BUFFER_FUNCS)
     return glBindBuffer