diff --git a/CHANGES b/CHANGES
index 69b14e7c..4906319d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,9 @@ What's New for OpenJPEG
 ! : changed
 + : added
 
+October 22, 2010
+* [antonin] Patch to support the MSVC Win 64 builds (from szekerest)
+
 October 22, 2010
 * [antonin] Currently the Visual Studio builds are broken in the SVN. Attached a patch to fix this issue (from szekerest)
 
diff --git a/libopenjpeg/opj_includes.h b/libopenjpeg/opj_includes.h
index 80d617e3..53739abf 100644
--- a/libopenjpeg/opj_includes.h
+++ b/libopenjpeg/opj_includes.h
@@ -89,14 +89,18 @@ Most compilers implement their own version of this keyword ...
 /* MSVC and Borland C do not have lrintf */
 #if defined(_MSC_VER) || defined(__BORLANDC__)
 static INLINE long lrintf(float f){
-	int i;
-
-	_asm{
-		fld f
-		fistp i
-	};
-
-	return i;
+#ifdef _M_X64
+    return (long)((f>0.0f) ? (f + 0.5f):(f -0.5f));
+#else
+    int i;
+ 
+    _asm{
+        fld f
+        fistp i
+    };
+ 
+    return i;
+#endif
 }
 #endif