diff --git a/pkgs/servers/samba/master.nix b/pkgs/servers/samba/master.nix
index f1dd7fe7b146..df1f9feb4de5 100644
--- a/pkgs/servers/samba/master.nix
+++ b/pkgs/servers/samba/master.nix
@@ -4,14 +4,14 @@
 } :
 
   (samba4.overrideAttrs(oldAttrs: rec {
-    name = "samba-master${version}";
-    version = "4.8.0_2018-01-25";
+    name = "samba-unstable-${version}";
+    version = "2018-03-09";
 
     src = fetchFromGitHub {
       owner = "samba-team";
       repo = "samba";
-      rev = "849169a7b6ed0beb78bbddf25537521c1ed2f8e1";
-      sha256 = "1535w787cy1x5ia9arjrg6hhf926wi8wm9qj0k0jgydy3600zpbv";
+      rev = "9e954bcbf43d67a18ee55f84cda0b09028f96b92";
+      sha256 = "07j1pwm4kax6pq21gq9gpmp7dhj5afdyvkhgyl3yz334mb41q11g";
     };
 
     # Remove unnecessary install flags, same as <4.8 patch