diff --git a/.changeset/dry-dogs-end.md b/.changeset/dry-dogs-end.md
new file mode 100644
index 0000000..2171831
--- /dev/null
+++ b/.changeset/dry-dogs-end.md
@@ -0,0 +1,5 @@
+---
+"ethereum-mars": patch
+---
+
+🧉 Change assumption of default configuration of solc compiler
diff --git a/packages/mars/src/verification.ts b/packages/mars/src/verification.ts
index eb8f415..e5f743b 100644
--- a/packages/mars/src/verification.ts
+++ b/packages/mars/src/verification.ts
@@ -104,7 +104,7 @@ function getBlockExplorerContractAddress(address: string, network?: string) {
 async function getCompilerOptions(waffleConfigPath: string) {
   const config = JSON.parse(fs.readFileSync(waffleConfigPath).toString())
   const compilerVersion = config.compilerVersion
-  const isOptimized = config.compilerOptions?.optimizer?.enabled ?? true
+  const isOptimized = config.compilerOptions?.optimizer?.enabled ?? false
   const optimizerRuns = !isOptimized ? 0 : config.compilerOptions?.optimizer?.runs ?? 200
   return {
     compilerVersion,