diff --git a/apps/solidity-compiler/src/app/compiler.ts b/apps/solidity-compiler/src/app/compiler.ts
index 6f499103b9..5a6e8eafaa 100644
--- a/apps/solidity-compiler/src/app/compiler.ts
+++ b/apps/solidity-compiler/src/app/compiler.ts
@@ -53,7 +53,7 @@ export class CompilerClientApi extends CompilerApiMixin(PluginClient) implements
   }
 
   setCompilerParameters (params) {
-    for (const key in Object.keys(params)) {
+    for (const key of Object.keys(params)) {
       localStorage.setItem(key, params[key])
     }
   }