diff --git a/lib/otp/Makefile.am b/lib/otp/Makefile.am
index 9a54e5384..6627c0701 100644
--- a/lib/otp/Makefile.am
+++ b/lib/otp/Makefile.am
@@ -3,6 +3,9 @@
 include $(top_srcdir)/Makefile.am.common
 
 AM_CPPFLAGS += $(INCLUDE_hcrypto) $(ROKEN_RENAME)
+if HAVE_DBHEADER
+AM_CPPFLAGS += -I$(DBHEADER)
+endif
 
 noinst_PROGRAMS = otptest