diff --git a/src/emulator/gba/mod.rs b/src/emulator/gba/mod.rs
index df97ad6..fa51cb3 100644
--- a/src/emulator/gba/mod.rs
+++ b/src/emulator/gba/mod.rs
@@ -180,6 +180,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/emulator/gcn/mod.rs b/src/emulator/gcn/mod.rs
index c6f13cf..39c69d0 100644
--- a/src/emulator/gcn/mod.rs
+++ b/src/emulator/gcn/mod.rs
@@ -150,6 +150,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/emulator/genesis/mod.rs b/src/emulator/genesis/mod.rs
index 84d5c25..ad941d8 100644
--- a/src/emulator/genesis/mod.rs
+++ b/src/emulator/genesis/mod.rs
@@ -166,6 +166,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/emulator/ps1/mod.rs b/src/emulator/ps1/mod.rs
index 8a1250a..f8c20dd 100644
--- a/src/emulator/ps1/mod.rs
+++ b/src/emulator/ps1/mod.rs
@@ -151,6 +151,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/emulator/ps2/mod.rs b/src/emulator/ps2/mod.rs
index b734dd5..05323b9 100644
--- a/src/emulator/ps2/mod.rs
+++ b/src/emulator/ps2/mod.rs
@@ -146,6 +146,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/emulator/sms/mod.rs b/src/emulator/sms/mod.rs
index 8b81e24..64bf063 100644
--- a/src/emulator/sms/mod.rs
+++ b/src/emulator/sms/mod.rs
@@ -130,6 +130,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/emulator/wii/mod.rs b/src/emulator/wii/mod.rs
index bf57084..72c7b60 100644
--- a/src/emulator/wii/mod.rs
+++ b/src/emulator/wii/mod.rs
@@ -231,6 +231,7 @@ impl Emulator {
 }
 
 /// A future that executes a future until the emulator closes.
+#[must_use = "You need to await this future."]
 pub struct UntilEmulatorCloses<'a, F> {
     emulator: &'a Emulator,
     future: F,
diff --git a/src/future/mod.rs b/src/future/mod.rs
index f255429..a9aa26a 100644
--- a/src/future/mod.rs
+++ b/src/future/mod.rs
@@ -271,6 +271,7 @@ impl<const N: usize> Signature<N> {
 }
 
 /// A future that executes a future until the process closes.
+#[must_use = "You need to await this future."]
 pub struct UntilProcessCloses<'a, F> {
     process: &'a Process,
     future: F,
diff --git a/src/future/time.rs b/src/future/time.rs
index d510a82..8436ad0 100644
--- a/src/future/time.rs
+++ b/src/future/time.rs
@@ -115,6 +115,7 @@ pub fn sleep(duration: Duration) -> Sleep {
 ///   // the future timed out
 /// }
 /// ```
+#[must_use = "You need to await this future."]
 pub struct Timeout<F> {
     sleep: Sleep,
     future: F,