diff --git a/src/osg/GLExtensions.cpp b/src/osg/GLExtensions.cpp
index da6899328..0949c1809 100644
--- a/src/osg/GLExtensions.cpp
+++ b/src/osg/GLExtensions.cpp
@@ -449,9 +449,9 @@ GLExtensions::GLExtensions(unsigned int contextID)
     isVertexShaderSupported = validContext && (shadersBuiltIn || osg::isGLExtensionSupported(contextID,"GL_ARB_vertex_shader"));
     isFragmentShaderSupported = validContext && (shadersBuiltIn || osg::isGLExtensionSupported(contextID,"GL_ARB_fragment_shader"));
     isLanguage100Supported = validContext && (shadersBuiltIn || osg::isGLExtensionSupported(contextID,"GL_ARB_shading_language_100"));
-    isGeometryShader4Supported = validContext && osg::isGLExtensionSupported(contextID,"GL_EXT_geometry_shader4");
+    isGeometryShader4Supported = validContext && (osg::isGLExtensionSupported(contextID,"GL_EXT_geometry_shader4") || osg::isGLExtensionSupported(contextID,"GL_OES_geometry_shader"));
     isGpuShader4Supported = validContext && osg::isGLExtensionSupported(contextID,"GL_EXT_gpu_shader4");
-    areTessellationShadersSupported = validContext && osg::isGLExtensionSupported(contextID, "GL_ARB_tessellation_shader");
+    areTessellationShadersSupported = validContext && (osg::isGLExtensionSupported(contextID, "GL_ARB_tessellation_shader") || osg::isGLExtensionSupported(contextID,"GL_OES_tessellation_shader"));
     isUniformBufferObjectSupported = validContext && osg::isGLExtensionSupported(contextID,"GL_ARB_uniform_buffer_object");
     isGetProgramBinarySupported = validContext && osg::isGLExtensionSupported(contextID,"GL_ARB_get_program_binary");
     isGpuShaderFp64Supported = validContext && osg::isGLExtensionSupported(contextID,"GL_ARB_gpu_shader_fp64");