diff --git a/ircd/Makefile.am b/ircd/Makefile.am
index e38f89b00..0a77ba4c5 100644
--- a/ircd/Makefile.am
+++ b/ircd/Makefile.am
@@ -209,8 +209,8 @@ db_env.lo:            AM_CPPFLAGS := ${ROCKSDB_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
 db_port.lo:           AM_CPPFLAGS := ${ROCKSDB_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
 db_allocator.lo:      AM_CPPFLAGS := ${ROCKSDB_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
 db_fixes.lo:          AM_CPPFLAGS := ${ROCKSDB_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
-db_fixes.lo:          AM_CPPFLAGS += -I$(top_srcdir)/deps/rocksdb/include
-db_fixes.lo:          AM_CPPFLAGS += -I$(top_srcdir)/deps/rocksdb
+db_fixes.lo:          AM_CPPFLAGS += -isystem $(top_srcdir)/deps/rocksdb/include
+db_fixes.lo:          AM_CPPFLAGS += -isystem $(top_srcdir)/deps/rocksdb
 exception.lo:         AM_CPPFLAGS := ${ASIO_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
 fmt.lo:               AM_CPPFLAGS := ${SPIRIT_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
 fmt.lo:               AM_CXXFLAGS := ${SPIRIT_UNIT_CXXFLAGS} ${AM_CXXFLAGS}