diff --git a/3rdparty/glsl-parser/glsl.lexer.h b/3rdparty/glsl-parser/glsl.lexer.h
index d7a29f87ee..7ab1939c9e 100644
--- a/3rdparty/glsl-parser/glsl.lexer.h
+++ b/3rdparty/glsl-parser/glsl.lexer.h
@@ -461,14 +461,6 @@ void yyfree ( void * , yyscan_t yyscanner );
 
 #endif
 
-#ifndef YY_NO_UNISTD_H
-/* Special case for "unistd.h", since it is non-ANSI. We include it way
- * down here because we want the user's section 1 to have been scanned first.
- * The user has a chance to override it with an option.
- */
-#include <unistd.h>
-#endif
-
 #ifndef YY_EXTRA_TYPE
 #define YY_EXTRA_TYPE void *
 #endif