diff --git a/lib/extendStringPrototype.js b/lib/extendStringPrototype.js
index 0d48614..f56bd26 100644
--- a/lib/extendStringPrototype.js
+++ b/lib/extendStringPrototype.js
@@ -73,18 +73,16 @@ module['exports'] = function() {
       } else {
         if (typeof(theme[prop]) === 'string') {
           colors[prop] = colors[theme[prop]];
-          addProperty(prop, function() {
-            return colors[theme[prop]](this);
-          });
         } else {
-          addProperty(prop, function() {
-            var ret = this;
-            for (var t = 0; t < theme[prop].length; t++) {
-              ret = colors[theme[prop][t]](ret);
-            }
-            return ret;
-          });
+          var tmp = colors[theme[prop][0]];
+          for (var t = 1; t < theme[prop].length; t++) {
+            tmp = tmp[theme[prop][t]];
+          }
+          colors[prop] = tmp;
         }
+        addProperty(prop, function() {
+          return colors[prop](this);
+        });
       }
     });
   }
diff --git a/tests/basic-test.js b/tests/basic-test.js
index 4cabf1a..8ffb149 100644
--- a/tests/basic-test.js
+++ b/tests/basic-test.js
@@ -61,3 +61,13 @@ assert.equal(typeof ('astring'.red), 'string');
 assert.equal(typeof ('astring'.error), 'string');
 
 assert.equal(s, 'string');
+
+colors.setTheme({custom: ['blue', 'bold', 'underline']});
+assert.equal(colors.custom(s),
+  '\x1b[34m' + '\x1b[1m' + '\x1b[4m' + s +
+  '\x1b[24m' + '\x1b[22m' + '\x1b[39m' );
+
+colors.setTheme({custom: ['red', 'italic', 'inverse']});
+assert.equal(colors.custom(s),
+  '\x1b[31m' + '\x1b[3m' + '\x1b[7m' + s +
+  '\x1b[27m' + '\x1b[23m' + '\x1b[39m' );
\ No newline at end of file
diff --git a/tests/safe-test.js b/tests/safe-test.js
index db886eb..b2a091c 100644
--- a/tests/safe-test.js
+++ b/tests/safe-test.js
@@ -57,3 +57,12 @@ colors.setTheme({error: 'red'});
 assert.equal(typeof (colors.red('astring')), 'string');
 assert.equal(typeof (colors.error('astring')), 'string');
 
+colors.setTheme({custom: ['blue', 'bold', 'underline']});
+assert.equal(colors.custom(s),
+  '\x1b[4m' + '\x1b[1m' + '\x1b[34m' + s +
+  '\x1b[39m' + '\x1b[22m' + '\x1b[24m' );
+
+colors.setTheme({custom: ['red', 'italic', 'inverse']});
+assert.equal(colors.custom(s),
+  '\x1b[7m' + '\x1b[3m' + '\x1b[31m' + s +
+  '\x1b[39m' + '\x1b[23m' + '\x1b[27m' );