diff --git a/pkgs/development/erlang-modules/build-hex.nix b/pkgs/development/erlang-modules/build-hex.nix
index 42a4bc9c238..ff6e47e5a80 100644
--- a/pkgs/development/erlang-modules/build-hex.nix
+++ b/pkgs/development/erlang-modules/build-hex.nix
@@ -1,86 +1,18 @@
-{ stdenv, writeText, erlang, rebar3, openssl, libyaml, fetchHex, fetchFromGitHub,
-  rebar3-pc, buildEnv }:
+{ stdenv, buildRebar3, fetchHex }:
 
-{ name, version, sha256 ? false
-, src ? null
-, setupHook ? null
+{ name, version, sha256
 , hexPkg ? name
-, buildInputs ? [], erlangDeps ? [], pluginDeps ? []
-, postPatch ? ""
-, compilePorts ? false
-, meta ? {}
 , ... }@attrs:
 
 with stdenv.lib;
 
 let
-  plugins = pluginDeps ++ (if compilePorts then [rebar3-pc] else []);
+  pkg = self: buildRebar3 (attrs // {
 
-
-  shell = drv: stdenv.mkDerivation {
-          name = "interactive-shell-${drv.name}";
-          buildInputs = [ drv ];
-    };
-
-  pkg = self: stdenv.mkDerivation (attrs // {
-
-    name = "${name}-${version}";
-    inherit version;
-
-    buildInputs = buildInputs ++ [ erlang rebar3 openssl libyaml ];
-    propagatedBuildInputs = erlangDeps ++ plugins;
-
-    src = if src == null then fetchHex {
+    src = fetchHex {
       pkg = hexPkg;
       inherit version;
       inherit sha256;
-    } else src;
-
-    setupHook = if setupHook == null
-    then writeText "setupHook.sh" ''
-       addToSearchPath ERL_LIBS "$1/lib/erlang/lib/"
-    ''
-    else setupHook;
-
-    postPatch = ''
-      rm -f rebar rebar3
-    '';
-
-    configurePhase = ''
-      runHook preConfigure
-      rebar3-nix-bootstrap
-      runHook postConfigure
-    '';
-
-    buildPhase = ''
-      runHook preBuild
-      HOME=. rebar3 compile
-      ${if compilePorts then ''
-        HOME=. rebar3 pc compile
-      '' else ''''}
-      runHook postBuild
-    '';
-
-    installPhase = ''
-      runHook preInstall
-      mkdir -p "$out/lib/erlang/lib/${name}-${version}"
-      for reldir in src ebin priv include; do
-        fd="_build/default/lib/${name}/$reldir"
-        [ -d "$fd" ] || continue
-        cp -Hrt "$out/lib/erlang/lib/${name}-${version}" "$fd"
-        success=1
-      done
-      runHook postInstall
-    '';
-
-    meta = {
-      inherit (erlang.meta) platforms;
-    } // meta;
-
-    passthru = {
-      packageName = name;
-      env = shell self;
-      inherit erlangDeps;
     };
   });
 in
diff --git a/pkgs/development/erlang-modules/build-rebar3.nix b/pkgs/development/erlang-modules/build-rebar3.nix
new file mode 100644
index 00000000000..3600f4aab6e
--- /dev/null
+++ b/pkgs/development/erlang-modules/build-rebar3.nix
@@ -0,0 +1,82 @@
+{ stdenv, writeText, erlang, rebar3, openssl, libyaml, fetchHex, fetchFromGitHub,
+  rebar3-pc, buildEnv }:
+
+{ name, version
+, src
+, setupHook ? null
+, buildInputs ? [], erlangDeps ? [], pluginDeps ? []
+, postPatch ? ""
+, compilePorts ? false
+, meta ? {}
+, ... }@attrs:
+
+with stdenv.lib;
+
+let
+  plugins = pluginDeps ++ (if compilePorts then [rebar3-pc] else []);
+
+
+  shell = drv: stdenv.mkDerivation {
+          name = "interactive-shell-${drv.name}";
+          buildInputs = [ drv ];
+    };
+
+  pkg = self: stdenv.mkDerivation (attrs // {
+
+    name = "${name}-${version}";
+    inherit version;
+
+    buildInputs = buildInputs ++ [ erlang rebar3 openssl libyaml ];
+    propagatedBuildInputs = erlangDeps ++ plugins;
+
+    inherit src;
+
+    setupHook = if setupHook == null
+    then writeText "setupHook.sh" ''
+       addToSearchPath ERL_LIBS "$1/lib/erlang/lib/"
+    ''
+    else setupHook;
+
+    postPatch = ''
+      rm -f rebar rebar3
+    '';
+
+    configurePhase = ''
+      runHook preConfigure
+      rebar3-nix-bootstrap
+      runHook postConfigure
+    '';
+
+    buildPhase = ''
+      runHook preBuild
+      HOME=. rebar3 compile
+      ${if compilePorts then ''
+        HOME=. rebar3 pc compile
+      '' else ''''}
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      runHook preInstall
+      mkdir -p "$out/lib/erlang/lib/${name}-${version}"
+      for reldir in src ebin priv include; do
+        fd="_build/default/lib/${name}/$reldir"
+        [ -d "$fd" ] || continue
+        cp -Hrt "$out/lib/erlang/lib/${name}-${version}" "$fd"
+        success=1
+      done
+      runHook postInstall
+    '';
+
+    meta = {
+      inherit (erlang.meta) platforms;
+    } // meta;
+
+    passthru = {
+      packageName = name;
+      env = shell self;
+      inherit erlangDeps;
+    };
+  });
+in
+  fix pkg
diff --git a/pkgs/development/erlang-modules/default.nix b/pkgs/development/erlang-modules/default.nix
index 4180ddc8121..fc5e6bad1f6 100644
--- a/pkgs/development/erlang-modules/default.nix
+++ b/pkgs/development/erlang-modules/default.nix
@@ -4,6 +4,8 @@ let
   self = rec {
     hex = import ./hex-packages.nix { callPackage = self.callPackage; };
     callPackage = pkgs.lib.callPackageWith (pkgs // self // hex);
+
+    buildRebar3 = callPackage ./build-rebar3.nix {};
     buildHex = callPackage ./build-hex.nix {};
   };
 in self // self.hex