diff --git a/toonz/sources/tnzbase/tscanner/tscannerutil.cpp b/toonz/sources/tnzbase/tscanner/tscannerutil.cpp
index 6064cbd..9d5d3fc 100644
--- a/toonz/sources/tnzbase/tscanner/tscannerutil.cpp
+++ b/toonz/sources/tnzbase/tscanner/tscannerutil.cpp
@@ -2,9 +2,7 @@
 
 #include "tscannerutil.h"
 
-#ifdef LINUX
 #include <cstring>
-#endif
 
 #define BUFBYTE(X, Y, BUF, BYTEWRAP, BITOFFS) \
 	(((UCHAR *)(BUF))[(((X) + (BITOFFS)) >> 3) + (Y) * (BYTEWRAP)])
diff --git a/toonz/sources/tnzext/plasticdeformer.cpp b/toonz/sources/tnzext/plasticdeformer.cpp
index 13d24e8..bdab0f4 100644
--- a/toonz/sources/tnzext/plasticdeformer.cpp
+++ b/toonz/sources/tnzext/plasticdeformer.cpp
@@ -12,9 +12,7 @@
 
 #include "ext/plasticdeformer.h"
 
-#if defined(LINUX)
 #include <cstring>
-#endif
 
 /*! \file plasticdeformer.cpp
 
diff --git a/toonz/sources/tnzext/plastichandle.cpp b/toonz/sources/tnzext/plastichandle.cpp
index ffb3619..46351a1 100644
--- a/toonz/sources/tnzext/plastichandle.cpp
+++ b/toonz/sources/tnzext/plastichandle.cpp
@@ -18,9 +18,7 @@ using namespace tcg::bgl;
 
 #include "ext/plastichandle.h"
 
-#if defined(LINUX)
 #include <cstring>
-#endif
 
 //***********************************************************************************************
 //    Distance building
diff --git a/toonz/sources/tnzext/tlin/tlin_cblas_wrap.cpp b/toonz/sources/tnzext/tlin/tlin_cblas_wrap.cpp
index 42e4201..d10f473 100644
--- a/toonz/sources/tnzext/tlin/tlin_cblas_wrap.cpp
+++ b/toonz/sources/tnzext/tlin/tlin_cblas_wrap.cpp
@@ -3,10 +3,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <memory>
-
-#if defined(LINUX)
 #include <cstring>
-#endif
 
 //blasint may either be common 4 bytes or extended 8 (long)...
 //Replace this and REBUILD the CBLAS with extended int if needed.