diff --git a/.changeset/fix-inspectable-bigint.md b/.changeset/fix-inspectable-bigint.md
new file mode 100644
index 00000000000..996530efb07
--- /dev/null
+++ b/.changeset/fix-inspectable-bigint.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+fix(Inspectable): handle BigInt in stringifyCircular
diff --git a/packages/effect/src/Inspectable.ts b/packages/effect/src/Inspectable.ts
index 9bab2d1e9c4..eac0488fa3b 100644
--- a/packages/effect/src/Inspectable.ts
+++ b/packages/effect/src/Inspectable.ts
@@ -229,7 +229,7 @@ export const stringifyCircular = (obj: unknown, whitespace?: number | string | u
           : cache.push(value) && (redactableState.fiberRefs !== undefined && isRedactable(value)
             ? value[symbolRedactable](redactableState.fiberRefs)
             : value)
-        : value,
+        : typeof value === "bigint" ? String(value) + "n" : value,
     whitespace
   )
   ;(cache as any) = undefined