diff --git a/reactos/dll/win32/setupapi/misc.c b/reactos/dll/win32/setupapi/misc.c
index fa35e3640fa..e8e70211d85 100644
--- a/reactos/dll/win32/setupapi/misc.c
+++ b/reactos/dll/win32/setupapi/misc.c
@@ -1448,7 +1448,7 @@ DWORD WINAPI SetupGetFileCompressionInfoA( PCSTR source, PSTR *name, PDWORD sour
         return ERROR_INVALID_PARAMETER;
 
     ret = SetupGetFileCompressionInfoExA( 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 = SetupGetFileCompressionInfoExA( source, actual_name, required, &required,
                                           source_size, target_size, type );