diff --git a/toonz/sources/stdfx/ino_line_blur.cpp b/toonz/sources/stdfx/ino_line_blur.cpp
index 282b5d3..dddd894 100644
--- a/toonz/sources/stdfx/ino_line_blur.cpp
+++ b/toonz/sources/stdfx/ino_line_blur.cpp
@@ -79,7 +79,9 @@ IGS_LINE_BLUR_EXPORT void convert(
 #include <iostream>
 #include <stdexcept>
 
+#ifdef _WIN32
 #include <windows.h>
+#endif
 
 namespace {