diff --git a/toolkit/tfile.cpp b/toolkit/tfile.cpp
index 464ba28a..7847a71f 100644
--- a/toolkit/tfile.cpp
+++ b/toolkit/tfile.cpp
@@ -62,7 +62,7 @@ File::File(const char *file)
   d = new FilePrivate(::strdup(file));
 
   d->readOnly = !isWritable(file);
-  d->file = fopen(file, d->readOnly ? "r" : "r+");
+  d->file = fopen(file, d->readOnly ? "rb" : "rb+");
 
   if(!d->file)
     debug("Could not open file " + String(file));