3 files changed, 7 insertions, 7 deletions
diff --git a/ext/dl/cfunc.c b/ext/dl/cfunc.c
index 33ac78490f..f13ff3405f 100644
--- a/ext/dl/cfunc.c
+++ b/ext/dl/cfunc.c
@@ -23,7 +23,7 @@ rb_dl_set_last_error(VALUE self, VALUE val)
     return Qnil;
 }
 
-#if defined(HAVE_WINDOWS_H)
+#if defined(_WIN32)
 #include <windows.h>
 static ID id_win32_last_error;
 
@@ -578,7 +578,7 @@ rb_dlcfunc_call(VALUE self, VALUE ary)
     }
 
     rb_dl_set_last_error(self, INT2NUM(errno));
-#if defined(HAVE_WINDOWS_H)
+#if defined(_WIN32)
     rb_dl_set_win32_last_error(self, INT2NUM(GetLastError()));
 #endif
 
@@ -607,13 +607,13 @@ void
 Init_dlcfunc(void)
 {
     id_last_error = rb_intern("__DL2_LAST_ERROR__");
-#if defined(HAVE_WINDOWS_H)
+#if defined(_WIN32)
     id_win32_last_error = rb_intern("__DL2_WIN32_LAST_ERROR__");
 #endif
     rb_cDLCFunc = rb_define_class_under(rb_mDL, "CFunc", rb_cObject);
     rb_define_alloc_func(rb_cDLCFunc, rb_dlcfunc_s_allocate);
     rb_define_module_function(rb_cDLCFunc, "last_error", rb_dl_get_last_error, 0);
-#if defined(HAVE_WINDOWS_H)
+#if defined(_WIN32)
     rb_define_module_function(rb_cDLCFunc, "win32_last_error", rb_dl_get_win32_last_error, 0);
 #endif
     rb_define_method(rb_cDLCFunc, "initialize", rb_dlcfunc_initialize, -1);
diff --git a/ext/dl/dl.h b/ext/dl/dl.h
index 2fa330f925..2b3b1f827e 100644
--- a/ext/dl/dl.h
+++ b/ext/dl/dl.h
@@ -20,7 +20,7 @@
 #define RTLD_NOW 0
 #endif
 #else
-# if defined(HAVE_WINDOWS_H)
+# if defined(_WIN32)
 #   include <windows.h>
 #   define dlopen(name,flag) ((void*)LoadLibrary(name))
 #   define dlerror() strerror(rb_w32_map_errno(GetLastError()))
diff --git a/ext/dl/handle.c b/ext/dl/handle.c
index ed042e12c7..6fc771ceb9 100644
--- a/ext/dl/handle.c
+++ b/ext/dl/handle.c
@@ -7,7 +7,7 @@
 
 VALUE rb_cDLHandle;
 
-#ifdef HAVE_WINDOWS_H
+#ifdef _WIN32
 # ifndef _WIN32_WCE
 static void *
 w32_coredll(void)
@@ -142,7 +142,7 @@ rb_dlhandle_initialize(int argc, VALUE argv[], VALUE self)
 
     rb_secure(2);
 
-#if defined(HAVE_WINDOWS_H)
+#if defined(_WIN32)
     if( !clib ){
 	HANDLE rb_libruby_handle(void);
 	ptr = rb_libruby_handle();