diff --git a/ocaml-3.10.1-map32bit.patch b/ocaml-3.10.1-map32bit.patch
new file mode 100644
index 0000000..b702981
--- /dev/null
+++ b/ocaml-3.10.1-map32bit.patch
@@ -0,0 +1,23 @@
+diff -ur ocaml-3.10.1.orig/byterun/unix.c ocaml-3.10.1/byterun/unix.c
+--- ocaml-3.10.1.orig/byterun/unix.c	2007-11-20 15:47:41.000000000 +0000
++++ ocaml-3.10.1/byterun/unix.c	2008-05-08 11:54:11.000000000 +0100
+@@ -346,6 +346,10 @@
+ 
+ #include <sys/mman.h>
+ 
++#ifndef MAP_32BIT /* Fedora bug 445545 */
++#define MAP_32BIT 0
++#endif
++
+ char *caml_aligned_mmap (asize_t size, int modulo, void **block)
+ {
+   char *raw_mem;
+@@ -354,7 +358,7 @@
+ 
+   Assert (modulo < Page_size);
+   raw_mem = (char *) mmap(last_addr, size + Page_size, PROT_READ | PROT_WRITE,
+-                          MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
++                          MAP_32BIT | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+   if (raw_mem == MAP_FAILED) return NULL;
+   last_addr = raw_mem + size + 2 * Page_size;
+   *block = raw_mem;
diff --git a/ocaml.spec b/ocaml.spec
index 28bbeb5..edb21f5 100644
--- a/ocaml.spec
+++ b/ocaml.spec
@@ -1,6 +1,6 @@
 Name:           ocaml
 Version:        3.10.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 
 Summary:        Objective Caml compiler and programming environment
 
@@ -17,6 +17,7 @@ Patch0:         ocaml-rpath.patch
 Patch1:         ocaml-user-cflags.patch
 Patch2:         ocaml-3.10.0-tclver.patch
 Patch3:         ocaml-3.10.1-ppc64.patch
+Patch4:         ocaml-3.10.1-map32bit.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires:  ncurses-devel
 BuildRequires:  gdbm-devel
@@ -194,6 +195,7 @@ man pages and info files.
 %patch1 -p1 -b .cflags
 %patch2 -p1 -b .tclver
 %patch3 -p1 -b .ppc64
+%patch4 -p1 -b .map32bit
 
 cp %{SOURCE2} refman.pdf
 
@@ -432,6 +434,9 @@ fi
 
 
 %changelog
+* Thu May  8 2008 Richard W.M. Jones <rjones@redhat.com> - 3.10.2-2
+- Pass MAP_32BIT to mmap (bz #445545).
+
 * Mon Apr 21 2008 Richard W.M. Jones <rjones@redhat.com> - 3.10.2-1
 - New upstream version 3.10.2 for Fedora 10.
 - Cleaned up several rpmlint errors & warnings.