diff --git a/src/stacks-rpc-api/smart-contracts/map-entry.ts b/src/stacks-rpc-api/smart-contracts/map-entry.ts
index dfb0344..222504f 100644
--- a/src/stacks-rpc-api/smart-contracts/map-entry.ts
+++ b/src/stacks-rpc-api/smart-contracts/map-entry.ts
@@ -38,7 +38,10 @@ export async function mapEntry(args: Args): Promise<Result<MapEntryResponse>> {
     };
   }
   init.method = "POST";
-  init.body = args.mapKey.startsWith("0x") ? args.mapKey : `0x${args.mapKey}`;
+  init.body = JSON.stringify(
+    args.mapKey.startsWith("0x") ? args.mapKey : `0x${args.mapKey}`,
+  );
+  init.headers = { ...init.headers, "Content-Type": "application/json" };
 
   const endpoint = `${args.baseUrl}/v2/map_entry/${args.contractAddress}/${args.contractName}/${args.mapName}?${search}`;
   const res = await fetch(endpoint, init);
@@ -47,10 +50,11 @@ export async function mapEntry(args: Args): Promise<Result<MapEntryResponse>> {
       name: "FetchMapEntryError",
       message: "Failed to fetch map entry.",
       data: {
+        init,
         status: res.status,
         statusText: res.statusText,
         endpoint,
-        bodyParseResult: await safePromise(res.json()),
+        bodyParseResult: await safePromise(res.text()),
       },
     });
   }