diff --git a/lib/color.js b/lib/color.js
index c8588c7..7ab92ec 100644
--- a/lib/color.js
+++ b/lib/color.js
@@ -139,7 +139,7 @@ class RGBColor extends ColorValue {
   #rgb;
 
   /**
-   * @param {string} fn
+   * @param {string|undefined} fn
    * @param {[number,number,number]} rgb
    */
   constructor(fn, rgb) {
@@ -246,6 +246,22 @@ class RGBPctColor extends ColorValue {
    * @returns {ColorValue}
    */
   getMinifiedValue() {
+    /** @type {number[]} */
+    const rgb = [];
+    // If all percentages are 0 or 100, convert to regular rgb.
+    for (const pct of this.#rgb) {
+      if (pct === 0) {
+        rgb.push(0);
+      } else if (pct === 100) {
+        rgb.push(255);
+      } else {
+        break;
+      }
+    }
+    if (rgb.length === 3) {
+      // @ts-ignore
+      return new RGBColor(undefined, rgb).getMinifiedValue();
+    }
     return new ColorValue(`rgb(${this.#rgb.map((n) => n + '%').join(',')})`);
   }
 }
diff --git a/test/lib/colors.test.js b/test/lib/colors.test.js
index 144b0a4..10419e1 100644
--- a/test/lib/colors.test.js
+++ b/test/lib/colors.test.js
@@ -14,6 +14,8 @@ describe('test parsing and minifying', () => {
     { in: 'rgb( 49.5%, 33.49% ,22.5% )', minified: 'rgb(49.5%,33.49%,22.5%)' },
     { in: 'rgb(165,42,42)', minified: 'brown' },
     { in: 'rgb( 50 100 150 /.1)', minified: 'rgb( 50 100 150 /.1)' },
+    { in: 'rgb(100%,0%,0%)', minified: 'red' },
+    { in: 'rgb(100%,100%,100%)', minified: '#fff' },
   ];
   for (const testCase of testCases) {
     it(`${testCase.in}`, () => {