diff --git a/config.h b/config.h
index 6661f03..073eae0 100644
--- a/config.h
+++ b/config.h
@@ -202,6 +202,10 @@
 
 #define HAVE_LIBUUID 1
 
+#define WITH_BLKDISCARD 1
+
+#define HAVE_FSYNC 1
+
 /* Define to `__inline__' or `__inline' if that's what the C compiler
    calls it, or to nothing if 'inline' is not supported under any name.  */
 #ifndef __cplusplus