diff --git a/src/main.c b/src/main.c
index fa56c89..6326134 100644
--- a/src/main.c
+++ b/src/main.c
@@ -53,7 +53,7 @@ typedef struct{
         char title[30];
 } StFlt;
 typedef struct{
-        int last_error;
+        long last_error;
         int error_level;
         int height;
         int width;