diff --git a/src/reqwest.rs b/src/reqwest.rs
index 29f3f51..c9ecfd5 100644
--- a/src/reqwest.rs
+++ b/src/reqwest.rs
@@ -106,7 +106,7 @@ pub trait ApiClient<State> {
 			queryable.url(api_state),
 		);
 		if let Some(body) = queryable.body(api_state) {
-			request = request.body(body?);
+			request = request.body(body?).header("Content-Type", "application/json");
 		}
 
 		Ok(request)