diff --git a/src/hash.c b/src/hash.c
index 42159112..45974dad 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -30,6 +30,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include "hash.h"
 
 #ifdef STANDALONE
+# undef xmalloc
+# undef xrealloc
+# undef xfree
+
 # define xmalloc malloc
 # define xrealloc realloc
 # define xfree free