diff --git a/pkgs/os-specific/linux/mmc-utils/default.nix b/pkgs/os-specific/linux/mmc-utils/default.nix
index 76927f79158b..304b10879d5e 100644
--- a/pkgs/os-specific/linux/mmc-utils/default.nix
+++ b/pkgs/os-specific/linux/mmc-utils/default.nix
@@ -10,10 +10,9 @@ stdenv.mkDerivation {
     sha256 = "D2QgntRsa6Y39nCkXQupXFbJR++JfBpMeEZE0Gv0btc=";
   };
 
-  makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
+  makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" "prefix=$(out)" ];
 
-  installPhase = ''
-    make install prefix=$out
+  postInstall = ''
     mkdir -p $out/share/man/man1
     cp man/mmc.1 $out/share/man/man1/
   '';