diff --git a/packages/mui-system/src/styleFunctionSx/styleFunctionSx.js b/packages/mui-system/src/styleFunctionSx/styleFunctionSx.js
index 084b3550890a1e..7f5ea843a748c1 100644
--- a/packages/mui-system/src/styleFunctionSx/styleFunctionSx.js
+++ b/packages/mui-system/src/styleFunctionSx/styleFunctionSx.js
@@ -95,7 +95,7 @@ export function unstable_createStyleFunctionSx(styleFunctionMapping = defaultSty
   return styleFunctionSx;
 }
 
-const styleFunctionSx = unstable_createStyleFunctionSx();
+const styleFunctionSx = unstable_createStyleFunctionSx(defaultStyleFunctionMapping);
 
 styleFunctionSx.filterProps = ['sx'];