diff --git a/src/hashtable.c b/src/hashtable.c
index 9a3f73b..1b0cd6c 100644
--- a/src/hashtable.c
+++ b/src/hashtable.c
@@ -62,7 +62,6 @@ static size_t primes[] = {
     12582917, 25165843, 50331653, 100663319, 201326611, 402653189,
     805306457, 1610612741
 };
-static const size_t num_primes = sizeof(primes) / sizeof(size_t);
 
 static JSON_INLINE size_t num_buckets(hashtable_t *hashtable)
 {