diff --git a/libsipc/include/sipc.h b/libsipc/include/sipc.h
index 3664412..0cabc3f 100644
--- a/libsipc/include/sipc.h
+++ b/libsipc/include/sipc.h
@@ -26,7 +26,7 @@ typedef enum {
 #define SI_DISCARD (1<<1)	//Do not process this.
 #define SI_NOSIGN (1<<2)	//This message is not signed.
 
-#define _SI_HEADER_CHECK 0xbeefbeefabad1deaul
+#define _SI_HEADER_CHECK 0xbeefbeefabad1dealu
 
 typedef struct {
 	union {
@@ -35,12 +35,14 @@ typedef struct {
 	};
 	uint32_t flags;
 	uint32_t data_len;
+	uint32_t __unused; //fix weird padding problem.
 	uint64_t check0;
 	uint64_t check;
 	uint8_t data[];
 } si_message;
 
 _Static_assert(sizeof(union { si_type t0; uint32_t pad;}) == sizeof(uint32_t), "packing error: sizeof(enum)!=sizeof(uint32_t)");
+_Static_assert(sizeof(si_message) == (sizeof(uint32_t)*4) + (sizeof(uint64_t)*2), "packing error: bad size, header padded size != 32 bytes?");
 
 #define SIEF_WARNING  0xaff000
 typedef enum {
diff --git a/libsipc/src/cli.c b/libsipc/src/cli.c
index 45887c4..dc84cea 100644
--- a/libsipc/src/cli.c
+++ b/libsipc/src/cli.c
@@ -305,6 +305,7 @@ int hang(const char* sock)
 
 int main(int argc, char** argv)
 {
+	//printf("%ld\n", sizeof(si_message));
 	int rc=0,secho=0;
 	char** _av = argv;
 	if(argv[1] && argv[1][0] == '-')