diff --git a/tools/regression/bpf/bpf_filter/Makefile b/tools/regression/bpf/bpf_filter/Makefile
index 5be486d1e27c..a777e703cf88 100644
--- a/tools/regression/bpf/bpf_filter/Makefile
+++ b/tools/regression/bpf/bpf_filter/Makefile
@@ -20,11 +20,13 @@ TEST_CASES=	test0001 test0002 test0003 test0004	\
 		test0069 test0070 test0071 test0072	\
 		test0073 test0074
 
+WARNS?=		6
+
 SYSDIR?=	${.CURDIR}/../../../../sys
 
 SRCS=		${.CURDIR}/bpf_test.c
 
-CFLAGS+=	-g -fno-builtin-abort -I${.CURDIR}/tests
+CFLAGS+=	-g -I${SYSDIR} -I${.CURDIR}/tests
 
 .if defined(BPF_BENCHMARK)
 CFLAGS+=	-DBPF_BENCHMARK -DLOG_LEVEL=0
@@ -39,11 +41,9 @@ CFLAGS+=	-DBPF_VALIDATE
 .if (${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386") && defined(BPF_JIT)
 SRCS+=		${SYSDIR}/net/bpf_jitter.c	\
 		${SYSDIR}/${MACHINE_ARCH}/${MACHINE_ARCH}/bpf_jit_machdep.c
-CFLAGS+=	-I${SYSDIR} -DBPF_JIT_COMPILER
-WARNS?=		6
+CFLAGS+=	-DBPF_JIT_COMPILER
 .else
 SRCS+=		${SYSDIR}/net/bpf_filter.c
-WARNS?=		1
 .endif
 
 .for TEST in ${TEST_CASES}
diff --git a/tools/regression/bpf/bpf_filter/bpf_test.c b/tools/regression/bpf/bpf_filter/bpf_test.c
index 31a20435890c..d8b46efd94fc 100644
--- a/tools/regression/bpf/bpf_filter/bpf_test.c
+++ b/tools/regression/bpf/bpf_filter/bpf_test.c
@@ -52,7 +52,10 @@ __FBSDID("$FreeBSD$");
 
 static void	sig_handler(int);
 
+#if defined(BPF_JIT_COMPILER) || defined(BPF_VALIDATE)
 static int	nins = sizeof(pc) / sizeof(pc[0]);
+#endif
+
 static int	verbose = LOG_LEVEL;
 
 #ifdef BPF_JIT_COMPILER
@@ -86,10 +89,6 @@ bpf_compile_and_filter(void)
 	return (ret);
 }
 
-#else
-
-u_int		bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
-
 #endif
 
 #ifdef BPF_VALIDATE
@@ -155,7 +154,7 @@ bpf_validate(const struct bpf_insn *f, int len)
 int
 main(void)
 {
-#if !defined(BPF_JIT_COMPILER)
+#ifndef BPF_JIT_COMPILER
 	u_int	i;
 #endif
 	u_int   ret;