diff --git a/superset-frontend/packages/superset-ui-core/src/dimension/computeMaxFontSize.ts b/superset-frontend/packages/superset-ui-core/src/dimension/computeMaxFontSize.ts
index a762d8b1f4460..ebd1f6e5688ba 100644
--- a/superset-frontend/packages/superset-ui-core/src/dimension/computeMaxFontSize.ts
+++ b/superset-frontend/packages/superset-ui-core/src/dimension/computeMaxFontSize.ts
@@ -27,8 +27,20 @@ function decreaseSizeUntil(
 ): number {
   let size = startSize;
   let dimension = computeDimension(size);
+
   while (!condition(dimension)) {
     size -= 1;
+
+    // Here if the size goes below zero most likely is because it
+    // has additional style applied in which case we assume the user
+    // knows what it's doing and we just let them use that.
+    // Visually it works, although it could have another
+    // check in place.
+    if (size < 0) {
+      size = startSize;
+      break;
+    }
+
     dimension = computeDimension(size);
   }
 
@@ -66,7 +78,7 @@ export default function computeMaxFontSize(
     size = decreaseSizeUntil(
       size,
       computeDimension,
-      dim => dim.width <= maxWidth,
+      dim => dim.width > 0 && dim.width <= maxWidth,
     );
   }
 
@@ -74,7 +86,7 @@ export default function computeMaxFontSize(
     size = decreaseSizeUntil(
       size,
       computeDimension,
-      dim => dim.height <= maxHeight,
+      dim => dim.height > 0 && dim.height <= maxHeight,
     );
   }
 
diff --git a/superset-frontend/packages/superset-ui-core/test/dimension/computeMaxFontSize.test.ts b/superset-frontend/packages/superset-ui-core/test/dimension/computeMaxFontSize.test.ts
index 99574f4ccf758..a64d819535c6b 100644
--- a/superset-frontend/packages/superset-ui-core/test/dimension/computeMaxFontSize.test.ts
+++ b/superset-frontend/packages/superset-ui-core/test/dimension/computeMaxFontSize.test.ts
@@ -59,5 +59,14 @@ describe('computeMaxFontSize(input)', () => {
         }),
       ).toEqual(25);
     });
+    it('ensure idealFontSize is used if the maximum font size calculation goes below zero', () => {
+      expect(
+        computeMaxFontSize({
+          maxWidth: 5,
+          idealFontSize: 34,
+          text: SAMPLE_TEXT[0],
+        }),
+      ).toEqual(34);
+    });
   });
 });