Index: reactos/dll/win32/setupapi/misc.c
===================================================================
--- reactos/dll/win32/setupapi/misc.c	(revision 57921)
+++ reactos/dll/win32/setupapi/misc.c	(working copy)
@@ -1491,7 +1491,7 @@
         return ERROR_INVALID_PARAMETER;
 
     ret = SetupGetFileCompressionInfoExW( source, NULL, 0, &required, NULL, NULL, NULL );
-    if (!(actual_name = MyMalloc( required ))) return ERROR_NOT_ENOUGH_MEMORY;
+    if (!(actual_name = MyMalloc( required*sizeof(WCHAR) ))) return ERROR_NOT_ENOUGH_MEMORY;
 
     ret = SetupGetFileCompressionInfoExW( source, actual_name, required, &required,
                                           source_size, target_size, type );