diff --git a/cddl/lib/drti/Makefile b/cddl/lib/drti/Makefile
--- a/cddl/lib/drti/Makefile
+++ b/cddl/lib/drti/Makefile
@@ -16,7 +16,6 @@
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/include
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/lib/libspl/include/
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/lib/libspl/include/os/freebsd
-CFLAGS+= -I${SRCTOP}/sys
 CFLAGS+= -include ${SRCTOP}/sys/contrib/openzfs/include/os/freebsd/spl/sys/ccompile.h
 CFLAGS+= -DHAVE_ISSETUGID
 CFLAGS+=	-I${SRCTOP}/sys/cddl/compat/opensolaris \
diff --git a/cddl/lib/libdtrace/Makefile b/cddl/lib/libdtrace/Makefile
--- a/cddl/lib/libdtrace/Makefile
+++ b/cddl/lib/libdtrace/Makefile
@@ -77,7 +77,6 @@
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/include
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/lib/libspl/include/
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/lib/libspl/include/os/freebsd
-CFLAGS+= -I${SRCTOP}/sys
 CFLAGS+= -include ${SRCTOP}/sys/contrib/openzfs/include/os/freebsd/spl/sys/ccompile.h
 CFLAGS+= -DHAVE_ISSETUGID
 
diff --git a/cddl/usr.sbin/dtrace/Makefile b/cddl/usr.sbin/dtrace/Makefile
--- a/cddl/usr.sbin/dtrace/Makefile
+++ b/cddl/usr.sbin/dtrace/Makefile
@@ -15,7 +15,6 @@
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/include
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/lib/libspl/include/
 CFLAGS+= -I${SRCTOP}/sys/contrib/openzfs/lib/libspl/include/os/freebsd
-CFLAGS+= -I${SRCTOP}/sys
 CFLAGS+= -I${SRCTOP}/cddl/compat/opensolaris/include
 CFLAGS+=	-I${SRCTOP}/sys/cddl/compat/opensolaris \
 		-I${SRCTOP}/cddl/compat/opensolaris/include \