diff --git a/src/lfs.h b/src/lfs.h
index 02ceafb..ea1720d 100644
--- a/src/lfs.h
+++ b/src/lfs.h
@@ -18,8 +18,10 @@
 #define chdir(p) (_chdir(p))
 #define getcwd(d, s) (_getcwd(d, s))
 #define rmdir(p) (_rmdir(p))
+#ifndef fileno
 #define fileno(f) (_fileno(f))
 #endif
+#endif
 
 #ifdef __cplusplus
 extern "C" {