diff --git a/src/Make_cyg.mak b/src/Make_cyg.mak
index 68c44f0..f955b4d 100644
--- a/src/Make_cyg.mak
+++ b/src/Make_cyg.mak
@@ -118,6 +118,9 @@
 
 DEFINES = -DWIN32 -DHAVE_PATHDEF -DFEAT_$(FEATURES) \
 	  -DWINVER=$(WINVER) -D_WIN32_WINNT=$(WINVER)
+ifeq ($(ARCH),x86-64)
+DEFINES+=-DMS_WIN64
+endif
 INCLUDES = -march=$(ARCH) -Iproto
 
 #>>>>> name of the compiler and linker, name of lib directory
diff --git a/src/Make_ming.mak b/src/Make_ming.mak
index 45d903f..7aa3994 100644
--- a/src/Make_ming.mak
+++ b/src/Make_ming.mak
@@ -328,6 +328,9 @@
 DEF_GUI=-DFEAT_GUI_W32 -DFEAT_CLIPBOARD
 DEFINES=-DWIN32 -DWINVER=$(WINVER) -D_WIN32_WINNT=$(WINVER) \
 	-DHAVE_PATHDEF -DFEAT_$(FEATURES)
+ifeq ($(ARCH),x86-64)
+DEFINES+=-DMS_WIN64
+endif
 ifeq ($(CROSS),yes)
 # cross-compiler prefix:
 CROSS_COMPILE = i586-pc-mingw32msvc-
diff --git a/src/version.c b/src/version.c
index 4d9af68..9a9a39d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -729,6 +729,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1313,
+/**/
     1312,
 /**/
     1311,