diff --git a/packages/core/src/input-binding/color/converter/color-string-test.ts b/packages/core/src/input-binding/color/converter/color-string-test.ts
index bfe8a918..4571ec7a 100644
--- a/packages/core/src/input-binding/color/converter/color-string-test.ts
+++ b/packages/core/src/input-binding/color/converter/color-string-test.ts
@@ -64,6 +64,7 @@ describe(createColorStringParser.name, () => {
 	[
 		'0x123',
 		'601',
+		'3200',
 		'112233',
 		'foobar',
 		'#eeffgg',
diff --git a/packages/core/src/input-binding/color/converter/color-string.ts b/packages/core/src/input-binding/color/converter/color-string.ts
index 09e88d49..3e195485 100644
--- a/packages/core/src/input-binding/color/converter/color-string.ts
+++ b/packages/core/src/input-binding/color/converter/color-string.ts
@@ -208,7 +208,7 @@ function parseHexRgbColor(text: string): IntColor | null {
 
 function parseHexRgbaColorComponents(text: string): ColorComponents4 | null {
 	const mRgb = text.match(
-		/^#?([0-9A-Fa-f])([0-9A-Fa-f])([0-9A-Fa-f])([0-9A-Fa-f])$/,
+		/^#([0-9A-Fa-f])([0-9A-Fa-f])([0-9A-Fa-f])([0-9A-Fa-f])$/,
 	);
 	if (mRgb) {
 		return [