diff --git a/shlr/sdb.mk b/shlr/sdb.mk
index 45957b2cc69a8..e631507a4283c 100644
--- a/shlr/sdb.mk
+++ b/shlr/sdb.mk
@@ -2,3 +2,4 @@
 SDB_ROOT=$(SHLR)/../subprojects/sdb
 SDB_CFLAGS+=-I$(SDB_ROOT)/include
 SDB_LDFLAGS+=$(SDB_ROOT)/lib/lib_sdb.a
+CFLAGS+=$(SDB_CFLAGS)