diff --git a/SLS_C/src/builtin.c b/SLS_C/src/builtin.c
index 15fc7d5..3145526 100644
--- a/SLS_C/src/builtin.c
+++ b/SLS_C/src/builtin.c
@@ -1218,6 +1218,7 @@ Boolean builtin_round(InterpreterState *interpreter_state) {
 
 Boolean builtin_seed(InterpreterState *interpreter_state) {
     NUMERIC_TYPE;
+    (void)af;
 
     if (type & NUMERIC_FLOAT) {
         return FALSE;