diff --git a/ets2panda/linter/src/lib/TypeScriptLinter.ts b/ets2panda/linter/src/lib/TypeScriptLinter.ts
index 981609604307eadc906f0e97af3b159d21d4f0be..b3309fb4e0eb056d39bfc350f10b1af5d86dd23b 100644
--- a/ets2panda/linter/src/lib/TypeScriptLinter.ts
+++ b/ets2panda/linter/src/lib/TypeScriptLinter.ts
@@ -8037,7 +8037,7 @@ export class TypeScriptLinter extends BaseTypeScriptLinter {
       return Boolean(
         t.flags & ts.TypeFlags.StringLike ||
           typeText === 'String' ||
-          typeText === 'number' ||
+          typeText.toLowerCase() === 'number' ||
           t.flags & ts.TypeFlags.NumberLike && (/^\d+$/).test(typeText) ||
           isLiteralInitialized && !hasExplicitTypeAnnotation ||
           t.flags & ts.TypeFlags.EnumLike
diff --git a/ets2panda/linter/test/main/swicth_expr.ets b/ets2panda/linter/test/main/swicth_expr.ets
index f44ab3e8e278572230b170104e0cbdd99d03e9c1..d3e2657a8e5415e5e743a008697b1090d4ec4941 100755
--- a/ets2panda/linter/test/main/swicth_expr.ets
+++ b/ets2panda/linter/test/main/swicth_expr.ets
@@ -409,3 +409,24 @@ function foo(index: number) {
   }
 }
 
+class CFE {
+    using: number = 0
+    initData(size: Number): void {
+        switch(size) { // legal
+            case 1:
+            this.using = 1;
+            break;
+            case 9:
+            this.using = 9;
+            break;
+            case 0:
+            this.using = 0;
+            break;
+            case 7:
+            this.using = 7;
+            break;
+            default:
+            this.using = 1907;
+        }
+    }
+}
\ No newline at end of file