diff --git a/common.h b/common.h
index f0a404f..893740d 100644
--- a/common.h
+++ b/common.h
@@ -23,8 +23,13 @@
  *
  */
 
+#ifndef _COMMON_H_
+#define _COMMON_H_
+
 #if defined(WIN32) || defined(_WIN32) || defined(_MSC_VER) || defined(__MINGW32__)
 #define _IS_WINDOWS
 #else
 #undef _IS_WINDOWS
-#endif
\ No newline at end of file
+#endif
+
+#endif // _COMMON_H_
diff --git a/consume.c b/consume.c
index 10422b3..4892c40 100644
--- a/consume.c
+++ b/consume.c
@@ -23,6 +23,10 @@
  *
  */
 
+#include "common.h"
+
+#ifndef _IS_WINDOWS
+
 #include <errno.h>
 #include <fcntl.h>
 #include <math.h>
@@ -34,7 +38,6 @@
 
 #include "crc32c.h"
 
-#ifndef _IS_WINDOWS
 int _crc32c_read_crc_write(int fd_in, int fd_out,
                            float in_timeout,
                            size_t buffsize, uint64_t total,