diff --git a/lib/dns/tests/Makefile.in b/lib/dns/tests/Makefile.in
index be0e156f8b..fd8ebb97f4 100644
--- a/lib/dns/tests/Makefile.in
+++ b/lib/dns/tests/Makefile.in
@@ -16,7 +16,7 @@ VERSION=@BIND9_VERSION@
 @BIND9_MAKE_INCLUDES@
 
 CINCLUDES =	-I. -Iinclude ${DNS_INCLUDES} ${ISC_INCLUDES} \
-		${OPENSSL_CFLAGS} @CMOCKA_CFLAGS@
+		${OPENSSL_CFLAGS} ${MAXMINDDB_CFLAGS} @CMOCKA_CFLAGS@
 CDEFINES =	-DTESTS="\"${top_builddir}/lib/dns/tests/\""
 
 ISCLIBS =	../../isc/libisc.@A@ ${OPENSSL_LIBS} ${JSON_C_LIBS} ${LIBXML2_LIBS} ${ZLIB_LIBS}