diff --git a/index.js b/index.js
index 3d40eb1..ceba9ae 100644
--- a/index.js
+++ b/index.js
@@ -28,7 +28,7 @@ var rgb2hex = module.exports = function rgb2hex(color) {
     /**
      * parse input
      */
-    var digits = /(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|0??\.([0-9]{0,3})))??\)/.exec(strippedColor);
+    var digits = /(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|0??\.([0-9]{0,})))??\)/.exec(strippedColor);
 
     if(!digits) {
         // or throw error if input isn't a valid rgb(a) color
diff --git a/rgb2hex.js b/rgb2hex.js
index 2112549..cd68c8d 100644
--- a/rgb2hex.js
+++ b/rgb2hex.js
@@ -21,7 +21,7 @@
         /**
          * parse input
          */
-        var digits = /(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|0??\.([0-9]{0,3})))??\)/.exec(strippedColor);
+        var digits = /(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|0??\.([0-9]{0,})))??\)/.exec(strippedColor);
 
         if(!digits) {
             // or throw error if input isn't a valid rgb(a) color
diff --git a/rgb2hex.min.js b/rgb2hex.min.js
index 18b7089..fd02b6e 100644
--- a/rgb2hex.min.js
+++ b/rgb2hex.min.js
@@ -1 +1 @@
-!function(r){var e=function(r){if("string"!=typeof r)throw new Error("color has to be type of `string`");if("#"===r.substr(0,1))return{hex:r,alpha:1};var e=r.replace(/\s+/g,""),t=/(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|0??\.([0-9]{0,3})))??\)/.exec(e);if(!t)throw new Error("given color ("+r+") isn't a valid rgb or rgba color");var n=parseInt(t[3],10),o=parseInt(t[4],10),a=parseInt(t[5],10),i=t[6]?/([0-9\.]+)/.exec(t[6])[0]:"1",s=(a|o<<8|n<<16|1<<24).toString(16).slice(1);return"."===i.substr(0,1)&&(i=parseFloat("0"+i)),1<i&&(i=1),i=parseFloat(Math.round(100*i))/100,{hex:"#"+s.toString(16),alpha:i}};"function"==typeof define&&define.amd?define("rgb2hex",function(){return e}):r.rgb2hex=e}(window);
\ No newline at end of file
+!function(r){var e=function(r){if("string"!=typeof r)throw new Error("color has to be type of `string`");if("#"===r.substr(0,1))return{hex:r,alpha:1};var e=r.replace(/\s+/g,""),t=/(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|0??\.([0-9]{0,})))??\)/.exec(e);if(!t)throw new Error("given color ("+r+") isn't a valid rgb or rgba color");var n=parseInt(t[3],10),o=parseInt(t[4],10),a=parseInt(t[5],10),i=t[6]?/([0-9\.]+)/.exec(t[6])[0]:"1",s=(a|o<<8|n<<16|1<<24).toString(16).slice(1);return"."===i.substr(0,1)&&(i=parseFloat("0"+i)),1<i&&(i=1),i=parseFloat(Math.round(100*i))/100,{hex:"#"+s.toString(16),alpha:i}};"function"==typeof define&&define.amd?define("rgb2hex",function(){return e}):r.rgb2hex=e}(window);
\ No newline at end of file
diff --git a/test/rgb2hex.test.js b/test/rgb2hex.test.js
index 7c67616..8860378 100644
--- a/test/rgb2hex.test.js
+++ b/test/rgb2hex.test.js
@@ -67,8 +67,8 @@ describe('rgb2hex should', () => {
             expect(parsedValue.alpha).toEqual(1)
         })
 
-        it('converting rgba(12,173,22,.67)', () => {
-            const input = 'rgba(12,173,22,.67)'
+        it('converting rgba(12,173,22,.67313)', () => {
+            const input = 'rgba(12,173,22,.67313)'
             const parsedValue = rgb2hex(input)
 
             expect(parsedValue).toHaveProperty('hex')