diff --git a/internal/cbm/grammar_haskell.c b/internal/cbm/grammar_haskell.c
index 58b70b7bf..61f67956a 100644
--- a/internal/cbm/grammar_haskell.c
+++ b/internal/cbm/grammar_haskell.c
@@ -1,4 +1,8 @@
 // Vendored tree-sitter grammar: haskell
 // Each grammar compiled as separate unit (conflicting static symbols).
+#include "vendored/common/tree_sitter/array.h" // strict-aliasing-safe helpers (tree-sitter#5242)
+typedef void *(*cbm_haskell_array_grow_fn)(void *, uint32_t, uint32_t *, uint32_t, size_t);
+_Static_assert(_Generic(&_array__grow, cbm_haskell_array_grow_fn: 1, default: 0),
+               "Haskell scanner requires strict-aliasing-safe array helpers");
 #include "vendored/grammars/haskell/parser.c"
 #include "vendored/grammars/haskell/scanner.c"