diff --git a/extensions/libxt_CHAOS.c b/extensions/libxt_CHAOS.c
index e6e6212..1fdcbf3 100644
--- a/extensions/libxt_CHAOS.c
+++ b/extensions/libxt_CHAOS.c
@@ -106,8 +106,7 @@ static struct xtables_target chaos_tg_reg = {
 	.extra_opts    = chaos_tg_opts,
 };
 
-void _init(void);
-void _init(void)
+static __attribute__((constructor)) void chaos_tg_ldr(void)
 {
 	xtables_register_target(&chaos_tg_reg);
 }
diff --git a/extensions/libxt_DELUDE.c b/extensions/libxt_DELUDE.c
index 8c7085e..42c8ef0 100644
--- a/extensions/libxt_DELUDE.c
+++ b/extensions/libxt_DELUDE.c
@@ -41,8 +41,7 @@ static struct xtables_target delude_tg_reg = {
 	.final_check   = delude_tg_check,
 };
 
-void _init(void);
-void _init(void)
+static __attribute__((constructor)) void delude_tg_ldr(void)
 {
 	xtables_register_target(&delude_tg_reg);
 }
diff --git a/extensions/libxt_DHCPADDR.c b/extensions/libxt_DHCPADDR.c
index 4171e5a..28cbb40 100644
--- a/extensions/libxt_DHCPADDR.c
+++ b/extensions/libxt_DHCPADDR.c
@@ -95,7 +95,7 @@ static struct xtables_target dhcpaddr_tg_reg = {
 	.extra_opts    = dhcpaddr_tg_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void dhcpaddr_tg_ldr(void)
 {
 	xtables_register_target(&dhcpaddr_tg_reg);
 }
diff --git a/extensions/libxt_ECHO.c b/extensions/libxt_ECHO.c
index c3454f2..39b9183 100644
--- a/extensions/libxt_ECHO.c
+++ b/extensions/libxt_ECHO.c
@@ -37,7 +37,7 @@ static struct xtables_target echo_tg_reg = {
 	.final_check   = echo_tg_check,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void echo_tg_ldr(void)
 {
 	xtables_register_target(&echo_tg_reg);
 }
diff --git a/extensions/libxt_IPMARK.c b/extensions/libxt_IPMARK.c
index fa1a6dc..f440758 100644
--- a/extensions/libxt_IPMARK.c
+++ b/extensions/libxt_IPMARK.c
@@ -68,7 +68,7 @@ static int ipmark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
 			exit_error(PARAMETER_PROBLEM, "Bad addr value `%s' - should be `src' or `dst'", optarg);
 		*flags |= FL_ADDR_USED;
 		return true;
-	
+
 	case '2':
 		param_act(P_ONLY_ONCE, "IPMARK", "and-mask", *flags & FL_AND_MASK_USED);
 		param_act(P_NO_INVERT, "IPMARK", "and-mask", invert);
@@ -175,7 +175,7 @@ static struct xtables_target ipmark_tg6_reg = {
 	.extra_opts    = ipmark_tg_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void ipmark_tg_ldr(void)
 {
 	xtables_register_target(&ipmark_tg4_reg);
 	xtables_register_target(&ipmark_tg6_reg);
diff --git a/extensions/libxt_LOGMARK.c b/extensions/libxt_LOGMARK.c
index a92e2eb..42659d9 100644
--- a/extensions/libxt_LOGMARK.c
+++ b/extensions/libxt_LOGMARK.c
@@ -111,8 +111,7 @@ static struct xtables_target logmark_tg_reg = {
 	.extra_opts    = logmark_tg_opts,
 };
 
-void _init(void);
-void _init(void)
+static __attribute__((constructor)) void logmark_tg_ldr(void)
 {
 	xtables_register_target(&logmark_tg_reg);
 }
diff --git a/extensions/libxt_SYSRQ.c b/extensions/libxt_SYSRQ.c
index 6041805..8f97bc1 100644
--- a/extensions/libxt_SYSRQ.c
+++ b/extensions/libxt_SYSRQ.c
@@ -43,7 +43,7 @@ static struct xtables_target sysrq_tg6_reg = {
 	.final_check   = sysrq_tg_check,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void sysrq_tg_ldr(void)
 {
 	xtables_register_target(&sysrq_tg4_reg);
 	xtables_register_target(&sysrq_tg6_reg);
diff --git a/extensions/libxt_TARPIT.c b/extensions/libxt_TARPIT.c
index f7edb24..0e072b2 100644
--- a/extensions/libxt_TARPIT.c
+++ b/extensions/libxt_TARPIT.c
@@ -32,7 +32,7 @@ static struct xtables_target tarpit_tg_reg = {
 	.final_check   = tarpit_tg_check,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void tarpit_tg_ldr(void)
 {
 	xtables_register_target(&tarpit_tg_reg);
 }
diff --git a/extensions/libxt_TEE.c b/extensions/libxt_TEE.c
index 408c0ae..18638b8 100644
--- a/extensions/libxt_TEE.c
+++ b/extensions/libxt_TEE.c
@@ -108,7 +108,7 @@ static struct xtables_target tee_tg_reg = {
 	.extra_opts    = tee_tg_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void tee_tg_ldr(void)
 {
 	xtables_register_target(&tee_tg_reg);
 }
diff --git a/extensions/libxt_condition.c b/extensions/libxt_condition.c
index ba8eacf..18b1ca3 100644
--- a/extensions/libxt_condition.c
+++ b/extensions/libxt_condition.c
@@ -92,7 +92,7 @@ static struct xtables_match condition_mt_reg = {
 	.extra_opts 	= condition_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void condition_mt_ldr(void)
 {
 	xtables_register_match(&condition_mt_reg);
 }
diff --git a/extensions/libxt_dhcpaddr.c b/extensions/libxt_dhcpaddr.c
index ac4da32..089a722 100644
--- a/extensions/libxt_dhcpaddr.c
+++ b/extensions/libxt_dhcpaddr.c
@@ -96,7 +96,7 @@ static struct xtables_match dhcpaddr_mt_reg = {
 	.extra_opts    = dhcpaddr_mt_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void dhcpaddr_mt_ldr(void)
 {
 	xtables_register_match(&dhcpaddr_mt_reg);
 }
diff --git a/extensions/libxt_fuzzy.c b/extensions/libxt_fuzzy.c
index 8ed2649..a588ed3 100644
--- a/extensions/libxt_fuzzy.c
+++ b/extensions/libxt_fuzzy.c
@@ -112,7 +112,7 @@ static struct xtables_match fuzzy_mt_reg = {
 	.extra_opts    = fuzzy_mt_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void fuzzy_mt_ldr(void)
 {
 	xtables_register_match(&fuzzy_mt_reg);
 }
diff --git a/extensions/libxt_geoip.c b/extensions/libxt_geoip.c
index 2f83e53..f0927e3 100644
--- a/extensions/libxt_geoip.c
+++ b/extensions/libxt_geoip.c
@@ -272,7 +272,7 @@ static struct xtables_match geoip_match = {
 	 .extra_opts    = geoip_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void geoip_mt_ldr(void)
 {
 	xtables_register_match(&geoip_match);
 }
diff --git a/extensions/libxt_ipp2p.c b/extensions/libxt_ipp2p.c
index bc22191..eb0d1f0 100644
--- a/extensions/libxt_ipp2p.c
+++ b/extensions/libxt_ipp2p.c
@@ -242,7 +242,7 @@ static struct xtables_match ipp2p_mt_reg = {
 	.extra_opts    = ipp2p_mt_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void ipp2p_mt_ldr(void)
 {
 	xtables_register_match(&ipp2p_mt_reg);
 }
diff --git a/extensions/libxt_portscan.c b/extensions/libxt_portscan.c
index 1be9e40..f460e5a 100644
--- a/extensions/libxt_portscan.c
+++ b/extensions/libxt_portscan.c
@@ -116,8 +116,7 @@ static struct xtables_match portscan_mt_reg = {
 	.extra_opts    = portscan_mt_opts,
 };
 
-void _init(void);
-void _init(void)
+static __attribute__((constructor)) void portscan_mt_ldr(void)
 {
 	xtables_register_match(&portscan_mt_reg);
 }
diff --git a/extensions/libxt_quota2.c b/extensions/libxt_quota2.c
index 5fb2bd4..de7a5f4 100644
--- a/extensions/libxt_quota2.c
+++ b/extensions/libxt_quota2.c
@@ -133,7 +133,7 @@ static struct xtables_match quota_mt2_reg = {
 	.extra_opts    = quota_mt2_opts,
 };
 
-static void _init(void)
+static __attribute__((constructor)) void quota2_mt_ldr(void)
 {
 	xtables_register_match(&quota_mt2_reg);
 }