diff --git a/njvm.c b/njvm.c
index 39feb49..d99c634 100644
--- a/njvm.c
+++ b/njvm.c
@@ -313,7 +313,7 @@ int main(int argc, char *argv[]) {
     int current = 0;
     stack.size = &size;
     stack.current = &current;
-    stack.stack = malloc(SIZE * 1024);
+    stack.stack = malloc(size * 1024);
     if (stack.stack == NULL) {
         perror("malloc");
     }