diff --git a/random.nix b/random.nix
index 2150fe2..c7f41e7 100644
--- a/random.nix
+++ b/random.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
 
   src = fetchgit {
     url = "https://gogs.prunetwork.fr/jpierre03/random.git";
-    sha256 = "1mfvn8iwznwlxxm89lkb1z6yxig1na5gjyh658v2drn5ic23zcxg";
+    sha256 = "1ymdix2vps4shzzaixgxvwpyi2y9fiq5fvh8a3xs5niq4xiz9yai";
   };
 
   # OUT shouldn't be needed (and shouldn't have worked), but random
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ gcc ];
   buildPhase = "make build";
-  installPhase = "make install";
+  installPhase = "make install PREFIX=\$out";
 
   meta = with stdenv.lib; {
     description = "Program thas exit with 0 or 1 randomly";