diff --git a/src/stack.c b/src/stack.c
index eddb044..9c47137 100644
--- a/src/stack.c
+++ b/src/stack.c
@@ -8,7 +8,7 @@
 
 Stack *program_init(uint16_t stacksize)
 {
-    Stack *stack = malloc(sizeof(&stack) + sizeof(Instruction) * PROGRAM_MAXSIZE + sizeof(int16_t) * MAX_LABELS +
+    Stack *stack = calloc(1,sizeof(&stack) + sizeof(Instruction) * PROGRAM_MAXSIZE + sizeof(int16_t) * MAX_LABELS +
                           sizeof(uint16_t) * stacksize);
 
     stack->stacksize = stacksize;