diff --git a/pcap-linux.c b/pcap-linux.c
index f8b3f10..463e5d4 100644
--- a/pcap-linux.c
+++ b/pcap-linux.c
@@ -2178,6 +2178,7 @@ pcap_setfilter_linux_common(pcap_t *handle, struct bpf_program *filter,
 	struct sock_fprog	fcode;
 	int			can_filter_in_kernel;
 	int			err = 0;
+	memset(&fcode, 0, sizeof(struct sock_fprog));
 #endif
 
 	if (!handle)