diff --git a/code/sdl/sdl_glimp.c b/code/sdl/sdl_glimp.c
index 7160d6f0..155b84be 100644
--- a/code/sdl/sdl_glimp.c
+++ b/code/sdl/sdl_glimp.c
@@ -627,7 +627,7 @@ static void GLimp_InitExtensions( void )
 
 	// GL_EXT_texture_env_add
 	glConfig.textureEnvAddAvailable = qfalse;
-	if ( SDL_GL_ExtensionSupported( "EXT_texture_env_add" ) )
+	if ( SDL_GL_ExtensionSupported( "GL_EXT_texture_env_add" ) )
 	{
 		if ( r_ext_texture_env_add->integer )
 		{