diff --git a/src/tools/uchardet.cpp b/src/tools/uchardet.cpp
index 3952e61..5e49e72 100644
--- a/src/tools/uchardet.cpp
+++ b/src/tools/uchardet.cpp
@@ -51,9 +51,11 @@ void detect(FILE * fp)
 {
     uchardet_t handle = uchardet_new();
 
-    while (!feof(fp))
+    while (1)
     {
         size_t len = fread(buffer, 1, BUFFER_SIZE, fp);
+        if (len == 0)
+            break;
         int retval = uchardet_handle_data(handle, buffer, len);
         if (retval != 0)
         {