diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
index dabf0eb80b..7e77c865d4 100644
--- a/cmd/zfs/zfs_main.c
+++ b/cmd/zfs/zfs_main.c
@@ -8668,7 +8668,6 @@ main(int argc, char **argv)
 	int i = 0;
 	char *cmdname;
 	char **newargv;
-	extern char **environ;
 
 	(void) setlocale(LC_ALL, "");
 	(void) setlocale(LC_NUMERIC, "C");
diff --git a/include/libzutil.h b/include/libzutil.h
index 8e081fff60..328487d78f 100644
--- a/include/libzutil.h
+++ b/include/libzutil.h
@@ -168,6 +168,7 @@ void color_end(void);
 int printf_color(const char *color, char *format, ...);
 
 #ifdef __linux__
+extern char **environ;
 _LIBZUTIL_H void zfs_setproctitle_init(int argc, char *argv[], char *envp[]);
 _LIBZUTIL_H void zfs_setproctitle(const char *fmt, ...);
 #else