diff --git a/packages/edit-site/src/components/global-styles/test/typography-utils.js b/packages/edit-site/src/components/global-styles/test/typography-utils.js
index cbc0fe53a3390d..e4ef4ed4b95d33 100644
--- a/packages/edit-site/src/components/global-styles/test/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/test/typography-utils.js
@@ -26,6 +26,29 @@ describe( 'typography utils', () => {
 					},
 					expected: '28px',
 				},
+				// Should return incoming value when already clamped.
+				{
+					preset: {
+						size: 'clamp(21px, 1.3125rem + ((1vw - 7.68px) * 2.524), 42px)',
+						fluid: false,
+					},
+					typographySettings: {
+						fluid: true,
+					},
+					expected:
+						'clamp(21px, 1.3125rem + ((1vw - 7.68px) * 2.524), 42px)',
+				},
+				// Should return incoming value with unsupported unit.
+				{
+					preset: {
+						size: '1000%',
+						fluid: false,
+					},
+					typographySettings: {
+						fluid: true,
+					},
+					expected: '1000%',
+				},
 				// Should return fluid value.
 				{
 					preset: {
diff --git a/packages/edit-site/src/components/global-styles/typography-utils.js b/packages/edit-site/src/components/global-styles/typography-utils.js
index 464021dfa0b9fc..6d0612bc0ecf74 100644
--- a/packages/edit-site/src/components/global-styles/typography-utils.js
+++ b/packages/edit-site/src/components/global-styles/typography-utils.js
@@ -4,19 +4,27 @@
  * ---------------------------------------------------------------
  */
 
+/**
+ * @typedef {Object} FluidPreset
+ * @property {string|undefined} max A maximum font size value.
+ * @property {string|undefined} min A minimum font size value.
+ */
+
+/**
+ * @typedef {Object} Preset
+ * @property {string}                        size  A default font size.
+ * @property {string}                        name  A font size name, displayed in the UI.
+ * @property {string}                        slug  A font size slug
+ * @property {boolean|FluidPreset|undefined} fluid A font size slug
+ */
+
 /**
  * Returns a font-size value based on a given font-size preset.
  * Takes into account fluid typography parameters and attempts to return a css formula depending on available, valid values.
  *
- * @param {Object}           preset
- * @param {string}           preset.size              A default font size.
- * @param {string}           preset.name              A font size name, displayed in the UI.
- * @param {string}           preset.slug              A font size slug.
- * @param {Object}           preset.fluid
- * @param {string|undefined} preset.fluid.max         A maximum font size value.
- * @param {string|undefined} preset.fluid.min         A minimum font size value.
- * @param {Object}           typographySettings
- * @param {boolean}          typographySettings.fluid Whether fluid typography is enabled.
+ * @param {Preset}  preset
+ * @param {Object}  typographySettings
+ * @param {boolean} typographySettings.fluid Whether fluid typography is enabled.
  *
  * @return {string} An font-size value
  */
@@ -40,7 +48,13 @@ export function getTypographyFontSizeValue( preset, typographySettings ) {
 		return defaultSize;
 	}
 
-	const fluidFontSizeSettings = preset?.fluid || {};
+	const fluidFontSizeSettings =
+		typeof preset?.fluid === 'object'
+			? preset.fluid
+			: {
+					min: undefined,
+					max: undefined,
+			  };
 
 	// Try to grab explicit min and max fluid font sizes.
 	let minimumFontSizeRaw = fluidFontSizeSettings?.min;