diff --git a/src/test.cpp b/src/test.cpp
index 837ef38..d9e4bb2 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -161,7 +161,7 @@ enum Symbol : int8_t {
   N_PAST_END, // Must be last nonterminal
 };
 
-static const char *symbolNames[N_PAST_END] = {
+static const char *symbolNames[] = {
     "T_COLON",
     "T_TRUE",
     "T_FALSE",
@@ -182,6 +182,8 @@ static const char *symbolNames[N_PAST_END] = {
     "N_WHITESPACE",
 };
 
+static_assert(sizeof(symbolNames) / sizeof(symbolNames[0]) == N_PAST_END);
+
 constexpr static struct Tables {
   constexpr Tables() {
     whitespace[' '] = true;