diff -r b18e0bf48a91 -r 5a49f274ab2d librazor/razor-internal.h
--- a/librazor/razor-internal.h	Thu Jul 14 12:49:48 2016 +0100
+++ b/librazor/razor-internal.h	Tue Jun 05 11:07:53 2018 +0100
@@ -418,7 +418,7 @@
 
 #ifdef MSWIN_API
 #define SKIP_DRIVE_LETTER(path) \
-	((RAZOR_ASCII_ISALPHA(path[0]) && (path)[1] == ':') ? \
+	((RAZOR_ASCII_ISALPHA((path)[0]) && (path)[1] == ':') ? \
 	   (path) + 2 : (path))
 #else
 #define SKIP_DRIVE_LETTER(path) (path)