diff --git a/Include/cpython/pystats.h b/Include/cpython/pystats.h
index 7c1459bde8f1cf..20eb969a9bac13 100644
--- a/Include/cpython/pystats.h
+++ b/Include/cpython/pystats.h
@@ -31,7 +31,7 @@
 
 #define PYSTATS_MAX_UOP_ID 512
 
-#define SPECIALIZATION_FAILURE_KINDS 50
+#define SPECIALIZATION_FAILURE_KINDS 60
 
 /* Stats for determining who is calling PyEval_EvalFrame */
 #define EVAL_CALL_TOTAL 0
diff --git a/Python/specialize.c b/Python/specialize.c
index 562e4a19d64a7f..f4b06918e68787 100644
--- a/Python/specialize.c
+++ b/Python/specialize.c
@@ -440,7 +440,9 @@ _Py_PrintSpecializationStats(int to_file)
 #define SPECIALIZATION_FAIL(opcode, kind) \
 do { \
     if (_Py_stats) { \
-        _Py_stats->opcode_stats[opcode].specialization.failure_kinds[kind]++; \
+        int _kind = (kind); \
+        assert(_kind < SPECIALIZATION_FAILURE_KINDS); \
+        _Py_stats->opcode_stats[opcode].specialization.failure_kinds[_kind]++; \
     } \
 } while (0)