diff --git a/src/include/config.h b/src/include/config.h
index 8b5960cb8ea5f936b3af229620c58362db429dbf..347985d0c6b7e2d84a52f81f36ff6ca72f958d3f 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -103,6 +103,7 @@
 #  define USE_LIMITS_H
 #  define USE_POSIX_TIME
 #  define NEED_CBRT
+#  define HAVE_MEMMOVE
 #endif
 
 #if defined(bsdi)