diff --git a/src/glsl/glcpp/pp.c b/src/glsl/glcpp/pp.c
index 8769f4f7e55..a1d00c4193b 100644
--- a/src/glsl/glcpp/pp.c
+++ b/src/glsl/glcpp/pp.c
@@ -141,7 +141,7 @@ remove_line_continuations(glcpp_parser_t *ctx, const char *shader)
 	return clean;
 }
 
-extern int
+int
 preprocess(void *talloc_ctx, const char **shader, char **info_log,
 	   const struct gl_extensions *extensions)
 {