diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 34360fe..0a3b74b 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -57,7 +57,7 @@
 #include <Menus.h>
 #endif
 
-#if !defined(MS_WINDOWS)
+#if !(defined(MS_WINDOWS) || defined(__CYGWIN__))
 #define HAVE_CREATEFILEHANDLER
 #endif
 
diff --git a/Python/dynload_shlib.c b/Python/dynload_shlib.c
index 16f15d9..2b0e74e 100644
--- a/Python/dynload_shlib.c
+++ b/Python/dynload_shlib.c
@@ -22,8 +22,13 @@
 
 
 const struct filedescr _PyImport_DynLoadFiletab[] = {
+#ifdef __CYGWIN__
+	{".pyd", "rb", C_EXTENSION},
+	{".dll", "rb", C_EXTENSION},
+#else
 	{".so", "rb", C_EXTENSION},
 	{"module.so", "rb", C_EXTENSION},
+#endif
 	{0, 0}
 };