diff --git a/vm.c b/vm.c
index 79576e1..0125e07 100644
--- a/vm.c
+++ b/vm.c
@@ -4,7 +4,7 @@
 #include "gc.h"
 #include "vm.h"
 
-struct virtualMachine *initVM() {
+struct virtualMachine *initVM(void) {
   struct virtualMachine *vm = malloc(sizeof(struct virtualMachine));
   vm->stackSize = 0;
   vm->refCount = 0;