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-rw-r--r--src/glsl/glcpp/glcpp-parse.y3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index f1119eb805a..287792439b5 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -290,7 +290,8 @@ control_line_success:
macro_t *macro;
if (strcmp("__LINE__", $4) == 0
|| strcmp("__FILE__", $4) == 0
- || strcmp("__VERSION__", $4) == 0)
+ || strcmp("__VERSION__", $4) == 0
+ || strncmp("GL_", $4, 3) == 0)
glcpp_error(& @1, parser, "Built-in (pre-defined)"
" macro names can not be undefined.");