diff --git a/headers/posix/net/if.h b/headers/posix/net/if.h
index 686b043626..85ce14c222 100644
--- a/headers/posix/net/if.h
+++ b/headers/posix/net/if.h
@@ -114,7 +114,7 @@ extern "C" {
 #endif
 
 unsigned if_nametoindex(const char* name);
-char* if_indextoname(unsigned ifindex, char* nameBuffer);
+char* if_indextoname(unsigned interfaceIndex, char* nameBuffer);
 struct if_nameindex* if_nameindex(void);
 void if_freenameindex(struct if_nameindex* interfaceArray);
 
diff --git a/headers/posix/sys/statvfs.h b/headers/posix/sys/statvfs.h
index ff7cb452b1..01fced69dc 100644
--- a/headers/posix/sys/statvfs.h
+++ b/headers/posix/sys/statvfs.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2005, Haiku, Inc. All Rights Reserved.
+ * Copyright 2005-2010, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _STAT_VFS_H_
@@ -31,8 +31,8 @@ struct statvfs {
 extern "C" {
 #endif
 
-int statvfs(const char *path, struct statvfs *buf);
-int fstatvfs(int fildes, struct statvfs *buf);
+int statvfs(const char *path, struct statvfs *buffer);
+int fstatvfs(int descriptor, struct statvfs *buffer);
 
 #ifdef __cplusplus
 }