diff --git a/pkgs/development/interpreters/ruby/ruby-1.8.7.nix b/pkgs/development/interpreters/ruby/ruby-1.8.7.nix
index 9b43368c617..c4fc52279b6 100644
--- a/pkgs/development/interpreters/ruby/ruby-1.8.7.nix
+++ b/pkgs/development/interpreters/ruby/ruby-1.8.7.nix
@@ -88,7 +88,8 @@ stdenv.mkDerivation rec {
     minorVersion = "8";
     teenyVersion = "7";
     patchLevel = "374";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-1.9.3.nix b/pkgs/development/interpreters/ruby/ruby-1.9.3.nix
index 77880870dd9..55c7ef6675e 100644
--- a/pkgs/development/interpreters/ruby/ruby-1.9.3.nix
+++ b/pkgs/development/interpreters/ruby/ruby-1.9.3.nix
@@ -112,7 +112,8 @@ stdenv.mkDerivation rec {
     minorVersion = "9";
     teenyVersion = "3";
     patchLevel = "547";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-2.0.0.nix b/pkgs/development/interpreters/ruby/ruby-2.0.0.nix
index 4c3344f7672..ddad429cb5c 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.0.0.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.0.0.nix
@@ -97,7 +97,8 @@ stdenv.mkDerivation rec {
     minorVersion = "0";
     teenyVersion = "0";
     patchLevel = "481";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.0.nix b/pkgs/development/interpreters/ruby/ruby-2.1.0.nix
index afe4cbef79d..178ebdf17be 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.1.0.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.0.nix
@@ -112,7 +112,8 @@ stdenv.mkDerivation rec {
     minorVersion = "1";
     teenyVersion = "0";
     patchLevel = "0";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.1.nix b/pkgs/development/interpreters/ruby/ruby-2.1.1.nix
index d87526b1570..27628a2cd7e 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.1.1.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.1.nix
@@ -111,7 +111,8 @@ stdenv.mkDerivation rec {
     minorVersion = "1";
     teenyVersion = "1";
     patchLevel = "0";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.2.nix b/pkgs/development/interpreters/ruby/ruby-2.1.2.nix
index e2ee74fac2d..0de24a9df03 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.1.2.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.2.nix
@@ -110,7 +110,8 @@ stdenv.mkDerivation rec {
     minorVersion = "1";
     teenyVersion = "2";
     patchLevel = "353";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.3.nix b/pkgs/development/interpreters/ruby/ruby-2.1.3.nix
index 0f8b2512322..04882a58bd4 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.1.3.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.3.nix
@@ -108,7 +108,8 @@ stdenv.mkDerivation rec {
     minorVersion = "1";
     teenyVersion = "3";
     patchLevel = "0";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }