diff --git a/crf_learn.cpp b/crf_learn.cpp
index 8965ce6..444dd28 100644
--- a/crf_learn.cpp
+++ b/crf_learn.cpp
@@ -6,7 +6,9 @@
 //  Copyright(C) 2005-2007 Taku Kudo <taku@chasen.org>
 //
 #include "crfpp.h"
+#ifdef _WIN32
 #include "winmain.h"
+#endif
 
 int main(int argc, char **argv) {
   return crfpp_learn(argc, argv);
diff --git a/crf_test.cpp b/crf_test.cpp
index 1d0ba26..97f85c4 100644
--- a/crf_test.cpp
+++ b/crf_test.cpp
@@ -6,7 +6,9 @@
 //  Copyright(C) 2005-2007 Taku Kudo <taku@chasen.org>
 //
 #include "crfpp.h"
+#ifdef _WIN32
 #include "winmain.h"
+#endif
 
 int main(int argc, char **argv) {
   return crfpp_test(argc, argv);