diff --git a/otp.c b/otp.c
index 58c263b..f23f3a2 100644
--- a/otp.c
+++ b/otp.c
@@ -2560,7 +2560,7 @@ int handle_file_encrypt(void) {
     int ascii_armor = (atoi(format_input) == 2) ? 1 : 0;
     
     // Generate default output filename
-    char default_output[512];
+    char default_output[1024]; // Increased buffer size to prevent truncation warnings
     if (ascii_armor) {
         snprintf(default_output, sizeof(default_output), "%s.otp.asc", input_file);
     } else {