diff --git a/src/osg/GLExtensions.cpp b/src/osg/GLExtensions.cpp
index 82939aef7..24e49917b 100644
--- a/src/osg/GLExtensions.cpp
+++ b/src/osg/GLExtensions.cpp
@@ -807,7 +807,7 @@ GLExtensions::GLExtensions(unsigned int contextID)
     isTextureFilterAnisotropicSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_filter_anisotropic");
     isTextureSwizzleSupported = isGLExtensionSupported(contextID,"GL_ARB_texture_swizzle");
     isTextureCompressionARBSupported = builtInSupport || isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_compression", 1.3f);
-    isTextureCompressionS3TCSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_compression_s3tc");
+    isTextureCompressionS3TCSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_compression_s3tc") || isGLExtensionSupported(contextID, "GL_S3_s3tc");
     isTextureCompressionPVRTC2BPPSupported = isGLExtensionSupported(contextID,"GL_IMG_texture_compression_pvrtc");
     isTextureCompressionPVRTC4BPPSupported = isTextureCompressionPVRTC2BPPSupported;//covered by same extension
     isTextureCompressionETCSupported = isGLExtensionSupported(contextID,"GL_OES_compressed_ETC1_RGB8_texture");