diff --git a/libs/gamecode/engine/pr_builtins.c b/libs/gamecode/engine/pr_builtins.c
index 7230f69c0..742a30095 100644
--- a/libs/gamecode/engine/pr_builtins.c
+++ b/libs/gamecode/engine/pr_builtins.c
@@ -93,6 +93,7 @@ void
 PR_RegisterBuiltins (progs_t *pr, builtin_t *builtins)
 {
 	builtin_t  *bi;
+	int         count;
 
 	if (!pr->builtin_hash) {
 		pr->builtin_hash = Hash_NewTable (1021, builtin_get_key, 0, pr);
@@ -101,6 +102,13 @@ PR_RegisterBuiltins (progs_t *pr, builtin_t *builtins)
 							 builtin_compare);
 	}
 
+	// count = 1 for terminator
+	for (bi = builtins, count = 1; bi->name; bi++)
+		count++;
+	bi = malloc (count * sizeof (builtin_t));
+	memcpy (bi, builtins, count * sizeof (builtin_t));
+	builtins = bi;
+
 	while (builtins->name) {
 		if (builtins->binum == 0 || builtins->binum >= PR_AUTOBUILTIN)
 			PR_Error (pr, "bad builtin number: %s = #%d", builtins->name,