diff --git a/src/lib/isRgbColor.js b/src/lib/isRgbColor.js
index 9458522ab..cb52c89e1 100644
--- a/src/lib/isRgbColor.js
+++ b/src/lib/isRgbColor.js
@@ -1,9 +1,9 @@
 import assertString from './util/assertString';
 
 const rgbColor = /^rgb\((([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]),){2}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\)$/;
-const rgbaColor = /^rgba\((([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]),){3}(0?\.\d|1(\.0)?|0(\.0)?)\)$/;
+const rgbaColor = /^rgba\((([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]),){3}(0?\.\d\d?|1(\.0)?|0(\.0)?)\)$/;
 const rgbColorPercent = /^rgb\((([0-9]%|[1-9][0-9]%|100%),){2}([0-9]%|[1-9][0-9]%|100%)\)$/;
-const rgbaColorPercent = /^rgba\((([0-9]%|[1-9][0-9]%|100%),){3}(0?\.\d|1(\.0)?|0(\.0)?)\)$/;
+const rgbaColorPercent = /^rgba\((([0-9]%|[1-9][0-9]%|100%),){3}(0?\.\d\d?|1(\.0)?|0(\.0)?)\)$/;
 
 export default function isRgbColor(str, includePercentValues = true) {
   assertString(str);
diff --git a/test/validators.test.js b/test/validators.test.js
index 6c68cd71a..0d3d4bd7c 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -4508,8 +4508,10 @@ describe('Validators', () => {
         'rgba(255,255,255,1)',
         'rgba(255,255,255,.1)',
         'rgba(255,255,255,0.1)',
+        'rgba(255,255,255,.12)',
         'rgb(5%,5%,5%)',
         'rgba(5%,5%,5%,.3)',
+        'rgba(5%,5%,5%,.32)',
       ],
       invalid: [
         'rgb(0,0,0,)',
@@ -4518,11 +4520,12 @@ describe('Validators', () => {
         'rgb()',
         'rgba(0,0,0)',
         'rgba(255,255,255,2)',
-        'rgba(255,255,255,.12)',
+        'rgba(255,255,255,.123)',
         'rgba(255,255,256,0.1)',
         'rgb(4,4,5%)',
         'rgba(5%,5%,5%)',
         'rgba(3,3,3%,.3)',
+        'rgba(5%,5%,5%,.321)',
         'rgb(101%,101%,101%)',
         'rgba(3%,3%,101%,0.3)',
         'rgb(101%,101%,101%) additional invalid string part',