diff --git a/05/solution.c b/05/solution.c
index 1b8cce3..61808db 100644
--- a/05/solution.c
+++ b/05/solution.c
@@ -11,7 +11,7 @@ typedef struct crate {
 
 #define alloc_stacks(C, N) \
     if (C) C = realloc(C, sizeof(crate) * N); \
-    else C = calloc(1, sizeof(crate) * N);
+    else C = malloc(sizeof(crate) * N);
 
 int main(void) {
     char l[BUFSIZ], *e, *m = 0;