diff --git a/advancecomp-64bit.patch b/advancecomp-64bit.patch
new file mode 100644
index 0000000..65728e0
--- /dev/null
+++ b/advancecomp-64bit.patch
@@ -0,0 +1,15 @@
+--- advancecomp-1.14/7z/Portable.h.64bit	2005-05-26 11:02:30.000000000 -0400
++++ advancecomp-1.14/7z/Portable.h	2005-05-26 10:50:22.000000000 -0400
+@@ -16,7 +16,11 @@
+ typedef UINT16 WORD;
+ typedef UINT32 DWORD;
+ 
+-typedef unsigned UINT_PTR;
++#if defined(__x86_64__) || defined(__s390x__) || defined(__ppc64__) || defined(__ia64__) || defined(__sparc64__) || defined(__alpha__)
++typedef unsigned long UINT_PTR;
++#else
++typedef unsigned int UINT_PTR;
++#endif
+ 
+ typedef int BOOL;
+ #define FALSE 0
diff --git a/advancecomp.spec b/advancecomp.spec
index b733828..954f26d 100644
--- a/advancecomp.spec
+++ b/advancecomp.spec
@@ -1,11 +1,12 @@
 Summary: Recompression utilities for .PNG, .MNG and .ZIP files
 Name: advancecomp
 Version: 1.14
-Release: 3
+Release: 4
 License: GPL
 Group: Applications/Emulators
 URL: http://advancemame.sourceforge.net/
 Source: http://dl.sf.net/advancemame/advancecomp-%{version}.tar.gz
+Patch0: advancecomp-64bit.patch
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 BuildRequires: gcc-c++, zlib-devel
 
@@ -17,7 +18,8 @@ The main features are :
 
 
 %prep
-%setup
+%setup -q
+%patch0 -p1 -b .64bit
 
 
 %build
@@ -42,6 +44,9 @@ The main features are :
 
 
 %changelog
+* Thu May 26 2005 Jeremy Katz <katzj@redhat.com> - 1.14-4
+- fix build on 64bit arches
+
 * Sun May 22 2005 Jeremy Katz <katzj@redhat.com> - 1.14-3
 - rebuild on all arches