diff --git a/packages/unitless/src/index.ts b/packages/unitless/src/index.ts
index 7302dc131e..dccabfa265 100644
--- a/packages/unitless/src/index.ts
+++ b/packages/unitless/src/index.ts
@@ -47,7 +47,10 @@ let unitlessKeys: Record<string, 1> = {
   strokeDashoffset: 1,
   strokeMiterlimit: 1,
   strokeOpacity: 1,
-  strokeWidth: 1
+  strokeWidth: 1,
+
+  // css properties that are unitless in some contexts  
+  shapeImageThreshold: 1 
 }
 
 export default unitlessKeys