diff --git a/src/script/squirrel.cpp b/src/script/squirrel.cpp
index ae8b9b03a0..d011243020 100644
--- a/src/script/squirrel.cpp
+++ b/src/script/squirrel.cpp
@@ -382,7 +382,7 @@ public:
 
 static WChar _io_file_lexfeed_ASCII(SQUserPointer file)
 {
-	char c;
+	unsigned char c;
 	if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) return c;
 	return 0;
 }