diff --git a/integration_test/tests/blockchain.rs b/integration_test/tests/blockchain.rs
index 1eb4e474..da56bb70 100644
--- a/integration_test/tests/blockchain.rs
+++ b/integration_test/tests/blockchain.rs
@@ -585,7 +585,7 @@ fn blockchain__get_tx_out_proof() {
     let (_address, tx) = node.create_mined_transaction();
     let txid = tx.compute_txid();
 
-    let _ = node.client.get_tx_out_proof(&[txid]).expect("gettxoutproof");
+    let _: String = node.client.get_tx_out_proof(&[txid]).expect("gettxoutproof");
 }
 
 #[test]
diff --git a/integration_test/tests/control.rs b/integration_test/tests/control.rs
index d4f10445..6a066693 100644
--- a/integration_test/tests/control.rs
+++ b/integration_test/tests/control.rs
@@ -23,7 +23,7 @@ fn control__get_rpc_info() {
 #[test]
 fn control__help() {
     let node = BitcoinD::with_wallet(Wallet::None, &[]);
-    let _ = node.client.help().unwrap();
+    let _: String = node.client.help().unwrap();
 }
 
 #[test]
@@ -35,11 +35,11 @@ fn control__logging() {
 #[test]
 fn control__stop() {
     let node = BitcoinD::with_wallet(Wallet::None, &[]);
-    let _ = node.client.stop().unwrap();
+    let _: String = node.client.stop().unwrap();
 }
 
 #[test]
 fn control__uptime() {
     let node = BitcoinD::with_wallet(Wallet::None, &[]);
-    let _ = node.client.uptime().unwrap();
+    let _: u32 = node.client.uptime().unwrap();
 }