diff --git a/a1/program.c b/a1/program.c
index 78f9cc5..af8d7a7 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -5,7 +5,7 @@
 
 #define MAX_SIZE 100
 
-struct stack {
+struct Stack {
     char data[MAX_SIZE];
     int size;
 } stack;