diff --git a/lib/e2p/e2p.h b/lib/e2p/e2p.h
index 4a68dd9a..5fa41f46 100644
--- a/lib/e2p/e2p.h
+++ b/lib/e2p/e2p.h
@@ -36,7 +36,7 @@ int getflags (int fd, unsigned long * flags);
 int getversion (int fd, unsigned long * version);
 int iterate_on_dir (const char * dir_name,
 		    int (*func) (const char *, struct dirent *, void *),
-		    void * private);
+		    void * private_arg);
 void list_super(struct ext2_super_block * s);
 void list_super2(struct ext2_super_block * s, FILE *f);
 void print_fs_errors (FILE * f, unsigned short errors);