1 files changed, 1 insertions, 1 deletions
diff --git a/src/runtime/c/pgf/linearizer.h b/src/runtime/c/pgf/linearizer.h
index e483824b0..b1d96b027 100644
--- a/src/runtime/c/pgf/linearizer.h
+++ b/src/runtime/c/pgf/linearizer.h
@@ -28,7 +28,7 @@ typedef GuEnum PgfCncTreeEnum;
 
 /// Begin enumerating concrete syntax variants.
 PgfCncTreeEnum*
-pgf_lzr_concretize(PgfConcr* concr, PgfExpr expr, GuPool* pool);
+pgf_lzr_concretize(PgfConcr* concr, PgfExpr expr, GuExn* err, GuPool* pool);
 
 typedef struct {
 } PgfLinNonExist;