diff --git a/src/os_win32.c b/src/os_win32.c
index af1232e..6b29cfc 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -4999,7 +4999,20 @@
     long_u
 mch_avail_mem(int special)
 {
-    if (g_PlatformId != VER_PLATFORM_WIN32_NT)
+#ifdef MEMORYSTATUSEX
+    PlatformId();
+    if (g_PlatformId == VER_PLATFORM_WIN32_NT)
+    {
+	MEMORYSTATUSEX	ms;
+
+	/* Need to use GlobalMemoryStatusEx() when there is more memory than
+	 * what fits in 32 bits. But it's not always available. */
+	ms.dwLength = sizeof(MEMORYSTATUSEX);
+	GlobalMemoryStatusEx(&ms);
+	return (long_u)((ms.ullAvailPhys + ms.ullAvailPageFile) >> 10);
+    }
+    else
+#endif
     {
 	MEMORYSTATUS	ms;
 
@@ -5007,14 +5020,6 @@
 	GlobalMemoryStatus(&ms);
 	return (long_u)((ms.dwAvailPhys + ms.dwAvailPageFile) >> 10);
     }
-    else
-    {
-	MEMORYSTATUSEX	ms;
-
-	ms.dwLength = sizeof(MEMORYSTATUSEX);
-	GlobalMemoryStatusEx(&ms);
-	return (long_u)((ms.ullAvailPhys + ms.ullAvailPageFile) >> 10);
-    }
 }
 
 #ifdef FEAT_MBYTE
diff --git a/src/version.c b/src/version.c
index 80d8c75..064af8b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    605,
+/**/
     604,
 /**/
     603,