diff --git a/src/context.c b/src/context.c
index 61e2f14..f33d965 100644
--- a/src/context.c
+++ b/src/context.c
@@ -263,7 +263,7 @@ struct us_listen_socket_t *us_socket_context_listen(int ssl, struct us_socket_co
         return 0;
     }
 
-    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_listen_socket_t));
+    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_listen_socket_t) - sizeof(struct us_poll_t));
     us_poll_init(p, listen_socket_fd, POLL_TYPE_SEMI_SOCKET);
     us_poll_start(p, context->loop, LIBUS_SOCKET_READABLE);
 
@@ -294,7 +294,7 @@ struct us_listen_socket_t *us_socket_context_listen_unix(int ssl, struct us_sock
         return 0;
     }
 
-    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_listen_socket_t));
+    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_listen_socket_t) - sizeof(struct us_poll_t));
     us_poll_init(p, listen_socket_fd, POLL_TYPE_SEMI_SOCKET);
     us_poll_start(p, context->loop, LIBUS_SOCKET_READABLE);
 
@@ -325,7 +325,7 @@ struct us_socket_t *us_socket_context_connect(int ssl, struct us_socket_context_
     }
 
     /* Connect sockets are semi-sockets just like listen sockets */
-    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_socket_t) + socket_ext_size);
+    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_socket_t) - sizeof(struct us_poll_t) + socket_ext_size);
     us_poll_init(p, connect_socket_fd, POLL_TYPE_SEMI_SOCKET);
     us_poll_start(p, context->loop, LIBUS_SOCKET_WRITABLE);
 
@@ -354,7 +354,7 @@ struct us_socket_t *us_socket_context_connect_unix(int ssl, struct us_socket_con
     }
 
     /* Connect sockets are semi-sockets just like listen sockets */
-    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_socket_t) + socket_ext_size);
+    struct us_poll_t *p = us_create_poll(context->loop, 0, sizeof(struct us_socket_t) - sizeof(struct us_poll_t) + socket_ext_size);
     us_poll_init(p, connect_socket_fd, POLL_TYPE_SEMI_SOCKET);
     us_poll_start(p, context->loop, LIBUS_SOCKET_WRITABLE);
 
diff --git a/src/crypto/openssl.c b/src/crypto/openssl.c
index 4473679..6f9b0cf 100644
--- a/src/crypto/openssl.c
+++ b/src/crypto/openssl.c
@@ -407,7 +407,7 @@ void *us_internal_ssl_socket_context_get_native_handle(struct us_internal_ssl_so
 struct us_internal_ssl_socket_context_t *us_internal_create_child_ssl_socket_context(struct us_internal_ssl_socket_context_t *context, int context_ext_size) {
     /* Create a new non-SSL context */
     struct us_socket_context_options_t options = {0};
-    struct us_internal_ssl_socket_context_t *child_context = (struct us_internal_ssl_socket_context_t *) us_create_socket_context(0, context->sc.loop, sizeof(struct us_internal_ssl_socket_context_t) + context_ext_size, options);
+    struct us_internal_ssl_socket_context_t *child_context = (struct us_internal_ssl_socket_context_t *) us_create_socket_context(0, context->sc.loop, sizeof(struct us_internal_ssl_socket_context_t) - sizeof(struct us_socket_context_t) + context_ext_size, options);
 
     /* The only thing we share is SSL_CTX */
     child_context->ssl_context = context->ssl_context;
@@ -645,7 +645,7 @@ struct us_internal_ssl_socket_context_t *us_internal_create_ssl_socket_context(s
     }
 
     /* Otherwise ee continue by creating a non-SSL context, but with larger ext to hold our SSL stuff */
-    struct us_internal_ssl_socket_context_t *context = (struct us_internal_ssl_socket_context_t *) us_create_socket_context(0, loop, sizeof(struct us_internal_ssl_socket_context_t) + context_ext_size, options);
+    struct us_internal_ssl_socket_context_t *context = (struct us_internal_ssl_socket_context_t *) us_create_socket_context(0, loop, sizeof(struct us_internal_ssl_socket_context_t) - sizeof(struct us_socket_context_t) + context_ext_size, options);
 
     /* I guess this is the only optional callback */
     context->on_server_name = NULL;
diff --git a/src/eventing/epoll_kqueue.c b/src/eventing/epoll_kqueue.c
index c4444b7..72c6118 100644
--- a/src/eventing/epoll_kqueue.c
+++ b/src/eventing/epoll_kqueue.c
@@ -287,7 +287,7 @@ unsigned int us_internal_accept_poll_event(struct us_poll_t *p) {
 /* Timer */
 #ifdef LIBUS_USE_EPOLL
 struct us_timer_t *us_create_timer(struct us_loop_t *loop, int fallthrough, unsigned int ext_size) {
-    struct us_poll_t *p = us_create_poll(loop, fallthrough, sizeof(struct us_internal_callback_t) + ext_size);
+    struct us_poll_t *p = us_create_poll(loop, fallthrough, sizeof(struct us_internal_callback_t) - sizeof(struct us_poll_t) + ext_size);
     int timerfd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC);
     if (timerfd == -1) {
       return NULL;
@@ -372,7 +372,7 @@ void us_timer_set(struct us_timer_t *t, void (*cb)(struct us_timer_t *t), int ms
 /* Async (internal helper for loop's wakeup feature) */
 #ifdef LIBUS_USE_EPOLL
 struct us_internal_async *us_internal_create_async(struct us_loop_t *loop, int fallthrough, unsigned int ext_size) {
-    struct us_poll_t *p = us_create_poll(loop, fallthrough, sizeof(struct us_internal_callback_t) + ext_size);
+    struct us_poll_t *p = us_create_poll(loop, fallthrough, sizeof(struct us_internal_callback_t) - sizeof(struct us_poll_t) + ext_size);
     us_poll_init(p, eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC), POLL_TYPE_CALLBACK);
 
     struct us_internal_callback_t *cb = (struct us_internal_callback_t *) p;
diff --git a/src/udp.c b/src/udp.c
index 9a63822..e19d3e6 100644
--- a/src/udp.c
+++ b/src/udp.c
@@ -118,7 +118,7 @@ struct us_udp_socket_t *us_create_udp_socket(struct us_loop_t *loop, struct us_u
     int ext_size = 0;
     int fallthrough = 0;
 
-    struct us_poll_t *p = us_create_poll(loop, fallthrough, sizeof(struct us_internal_udp_t) + ext_size);
+    struct us_poll_t *p = us_create_poll(loop, fallthrough, sizeof(struct us_internal_udp_t) - sizeof(struct us_poll_t) + ext_size);
     us_poll_init(p, fd, POLL_TYPE_CALLBACK);
 
     struct us_internal_udp_t *cb = (struct us_internal_udp_t *) p;