diff --git a/src/matrix/helpers.ts b/src/matrix/helpers.ts
index 6c8914a..0e78c1b 100644
--- a/src/matrix/helpers.ts
+++ b/src/matrix/helpers.ts
@@ -192,7 +192,8 @@ export async function doClientApiCall(method: string, endpoint: string, query?:
             "Content-Type": contentType,
         };
     } else {
-        requestOptions["json"] = body;
+        requestOptions["json"] = true;
+        requestOptions["body"] = body;
     }
 
     return new Promise((resolve, reject) => {