diff --git a/lib/irs/tests/Makefile.in b/lib/irs/tests/Makefile.in
index c854014e7e..41f439e97d 100644
--- a/lib/irs/tests/Makefile.in
+++ b/lib/irs/tests/Makefile.in
@@ -18,7 +18,7 @@ VERSION=@BIND9_VERSION@
 
 @BIND9_MAKE_INCLUDES@
 
-CINCLUDES =	-I. -Iinclude -I../include ${ISC_INCLUDES}
+CINCLUDES =	-I. -Iinclude -I../include ${ISC_INCLUDES} ${IRS_INCLUDES}
 CDEFINES =	-DTESTS="\"${top_builddir}/lib/irs/tests/\""
 
 CFGLIBS =	../../isccfg/libisccfg.@A@