diff -ur ocamlnet-3.7.4.old/src/netsys/netsys_c_event.c ocamlnet-3.7.4/src/netsys/netsys_c_event.c
--- ocamlnet-3.7.4.old/src/netsys/netsys_c_event.c	2014-05-12 20:00:39.000000000 +0100
+++ ocamlnet-3.7.4/src/netsys/netsys_c_event.c	2014-08-30 18:12:48.443050478 +0100
@@ -142,7 +142,7 @@
 
     case NE_EVENTFD:
 	{
-	    int64 buf;
+	    int64_t buf;
 	    buf = 1;
 	    if (ne->fd1 >= 0) {
 		int code;
@@ -391,7 +391,7 @@
 {
 #ifdef HAVE_POLL
     struct not_event *ne;
-    int64 n;
+    int64_t n;
     char buf[1];
     int code, ok, e;
     CAMLparam1(nev);
diff -ur ocamlnet-3.7.4.old/src/netsys/netsys_c_fadvise.c ocamlnet-3.7.4/src/netsys/netsys_c_fadvise.c
--- ocamlnet-3.7.4.old/src/netsys/netsys_c_fadvise.c	2014-05-12 20:00:39.000000000 +0100
+++ ocamlnet-3.7.4/src/netsys/netsys_c_fadvise.c	2014-08-30 18:12:48.446050487 +0100
@@ -23,7 +23,7 @@
 CAMLprim value netsys_fadvise(value fd, value start, value len, value adv) {
 #ifdef HAVE_POSIX_FADVISE
     int adv_int, r;
-    int64 start_int, len_int;
+    int64_t start_int, len_int;
     off_t start_off, len_off;
     /* Att: off_t might be 64 bit even on 32 bit systems! */
 
@@ -41,9 +41,9 @@
     start_int = Int64_val(start);
     len_int = Int64_val(len);
 
-    if ( ((int64) ((off_t) start_int)) != start_int )
+    if ( ((int64_t) ((off_t) start_int)) != start_int )
 	failwith("Netsys.fadvise: large files not supported on this OS");
-    if ( ((int64) ((off_t) len_int)) != len_int )
+    if ( ((int64_t) ((off_t) len_int)) != len_int )
 	failwith("Netsys.fadvise: large files not supported on this OS");
 
     start_off = start_int;
diff -ur ocamlnet-3.7.4.old/src/netsys/netsys_c_fallocate.c ocamlnet-3.7.4/src/netsys/netsys_c_fallocate.c
--- ocamlnet-3.7.4.old/src/netsys/netsys_c_fallocate.c	2014-05-12 20:00:39.000000000 +0100
+++ ocamlnet-3.7.4/src/netsys/netsys_c_fallocate.c	2014-08-30 18:12:48.442050481 +0100
@@ -20,16 +20,16 @@
 CAMLprim value netsys_fallocate(value fd, value start, value len) {
 #ifdef HAVE_POSIX_FALLOCATE
     int r;
-    int64 start_int, len_int;
+    int64_t start_int, len_int;
     off_t start_off, len_off;
     /* Att: off_t might be 64 bit even on 32 bit systems! */
 
     start_int = Int64_val(start);
     len_int = Int64_val(len);
 
-    if ( ((int64) ((off_t) start_int)) != start_int )
+    if ( ((int64_t) ((off_t) start_int)) != start_int )
 	failwith("Netsys.fadvise: large files not supported on this OS");
-    if ( ((int64) ((off_t) len_int)) != len_int )
+    if ( ((int64_t) ((off_t) len_int)) != len_int )
 	failwith("Netsys.fadvise: large files not supported on this OS");
 
     start_off = start_int;
diff -ur ocamlnet-3.7.4.old/src/netsys/netsys_c_mem.c ocamlnet-3.7.4/src/netsys/netsys_c_mem.c
--- ocamlnet-3.7.4.old/src/netsys/netsys_c_mem.c	2014-05-12 20:00:39.000000000 +0100
+++ ocamlnet-3.7.4/src/netsys/netsys_c_mem.c	2014-08-30 18:12:48.445050479 +0100
@@ -182,7 +182,7 @@
     void *addr, *eff_addr;
     intnat size;
     uintnat basize;
-    int64 pos0;
+    int64_t pos0;
     uintnat pagesize, delta;
 
     /* Avoid here seeking at all costs. On some systems, shared memory
@@ -190,7 +190,7 @@
     */
     fd = Int_val(fdv);
     pos0 = Int64_val(posv);
-    if (((int64) ((off_t) pos0)) != pos0)
+    if (((int64_t) ((off_t) pos0)) != pos0)
 	failwith("Netsys_mem: large files not supported on this OS");
     pos = pos0;
     addr = (void *) Nativeint_val(addrv);
@@ -913,8 +913,8 @@
 				    caml_id = 'b';
 				    break;
 				}
-			    case 'i': /* int32 */
-			    case 'j': /* int64 */
+			    case 'i': /* int32_t */
+			    case 'j': /* int64_t */
 			    case 'n': /* nativeint */
 				if (!enable_customs) {
 #ifdef DEBUG