diff --git a/src/caesarcrypt.c b/src/caesarcrypt.c
index 10def7f..3d2d6fd 100644
--- a/src/caesarcrypt.c
+++ b/src/caesarcrypt.c
@@ -12,6 +12,7 @@
 #include "dyninput.h"
 
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 
 
@@ -24,11 +25,12 @@ int main()
 		,stdout
 	);
 	char buf[4];
+	int64_t maxsize = INT64_MAX;
 	fgets(buf, 3, stdin);
 	int choice = strtol(buf, NULL, 10);
 
 	fputs("Enter your message text: ", stdout);
-	char* msg = dyninput_str(INT64_MAX);
+	char* msg = dyninput_str(maxsize);
 	if (!msg)
 	{
 		puts("ERROR: String input failed! Exiting...");
@@ -41,18 +43,18 @@ int main()
 
 	if (choice == 1)
 	{
-		caesar_encrypt(msg, 128, key);
+		caesar_encrypt(msg, maxsize, key);
 		puts("\nYour encrypted message is:");
-		for (int i = 0; i < 128 && msg[i]; i++)
+		for (int i = 0; i < maxsize && msg[i]; i++)
 		{
 			putchar(msg[i]);
 		}
 	}
 	else if (choice == 2)
 	{
-		caesar_decrypt(msg, 128, key);
+		caesar_decrypt(msg, maxsize, key);
 		puts("\nYour decrypted message is:");
-		for (int i = 0; i < 128 && msg[i]; i++)
+		for (int i = 0; i < maxsize && msg[i]; i++)
 		{
 			putchar(msg[i]);
 		}
diff --git a/src/crypt.c b/src/crypt.c
index aa15d0b..adba553 100644
--- a/src/crypt.c
+++ b/src/crypt.c
@@ -9,7 +9,9 @@
 */
 
 #include "crypt.h"
+
 #include <stdbool.h>
+#include <stdint.h>
 
 
 /* 
@@ -43,9 +45,9 @@ inline bool isupper(char c)
 }
 
 
-void caesar_encrypt(char* str, int size, int key)
+void caesar_encrypt(char* str, int64_t size, int key)
 {
-	for (int i = 0; i < size && str[i] != '\n'; i++)
+	for (int64_t i = 0; i < size && str[i] != '\n'; i++)
 		if (str[i] != ' ')
 		{
 			bool upper = isupper(str[i]);
@@ -56,9 +58,9 @@ void caesar_encrypt(char* str, int size, int key)
 }
 
 
-void caesar_decrypt(char* str, int size, int key)
+void caesar_decrypt(char* str, int64_t size, int key)
 {
-	for (int i = 0; i < size && str[i] != '\n'; i++)
+	for (int64_t i = 0; i < size && str[i] != '\n'; i++)
 		if (str[i] != ' ')
 		{
 			bool upper = isupper(str[i]);
diff --git a/src/crypt.h b/src/crypt.h
index cfe42dd..3ce733b 100644
--- a/src/crypt.h
+++ b/src/crypt.h
@@ -9,8 +9,9 @@
 */
 
 #pragma once
+#include <stdint.h>
 
 
-void caesar_encrypt(char* str, int size, int key);
+void caesar_encrypt(char* str, int64_t size, int key);
 
-void caesar_decrypt(char* str, int size, int key);
+void caesar_decrypt(char* str, int64_t size, int key);