diff --git a/lib/libcasper/Makefile b/lib/libcasper/Makefile
index af0701be396..97cf1df329d 100644
--- a/lib/libcasper/Makefile
+++ b/lib/libcasper/Makefile
@@ -3,4 +3,6 @@
 SUBDIR=		libcasper
 SUBDIR+=	services
 
+SUBDIR_PARALLEL=
+
 .include <bsd.subdir.mk>
diff --git a/lib/libcasper/services/Makefile b/lib/libcasper/services/Makefile
index 39b79af6885..c80e58932f1 100644
--- a/lib/libcasper/services/Makefile
+++ b/lib/libcasper/services/Makefile
@@ -6,4 +6,6 @@ SUBDIR+=	cap_pwd
 SUBDIR+=	cap_random
 SUBDIR+=	cap_sysctl
 
+SUBDIR_PARALLEL=
+
 .include <bsd.subdir.mk>