diff --git a/configure.in b/configure.in
index fce72f6..c8724d2 100644
--- a/configure.in
+++ b/configure.in
@@ -37,6 +37,7 @@ if test $ac_cv_dbmopen = no; then
 
 	if test $ac_cv_libdb = yes; then
 		LIBS="$LIBS -ldb"
+		AC_DEFINE(HAVE_LIBDB)
 	else
 		AC_MSG_ERROR([Could not find dbm_open(), you must install libdb])
 	fi
diff --git a/isync.h b/isync.h
index 3b1f8a9..ee0ca4e 100644
--- a/isync.h
+++ b/isync.h
@@ -18,14 +18,18 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#if HAVE_LIBDB
 #define DB_DBM_HSEARCH 1
+#include <db.h>
+#else
+#include <ndbm.h>
+#endif
 
 #include <sys/types.h>
 #include <stdarg.h>
 #if HAVE_LIBSSL
 #include <openssl/ssl.h>
 #endif
-#include <db.h>
 #include "debug.h"
 
 typedef struct