diff --git a/exercises/07_threads/09_bounded/src/lib.rs b/exercises/07_threads/09_bounded/src/lib.rs
index e661e68fca..a67767add4 100644
--- a/exercises/07_threads/09_bounded/src/lib.rs
+++ b/exercises/07_threads/09_bounded/src/lib.rs
@@ -38,7 +38,7 @@ enum Command {
     },
 }
 
-pub fn server(receiver: Receiver<Command>) {
+fn server(receiver: Receiver<Command>) {
     let mut store = TicketStore::new();
     loop {
         match receiver.recv() {
diff --git a/exercises/07_threads/10_patch/src/lib.rs b/exercises/07_threads/10_patch/src/lib.rs
index 492f767be9..eb004698cf 100644
--- a/exercises/07_threads/10_patch/src/lib.rs
+++ b/exercises/07_threads/10_patch/src/lib.rs
@@ -63,7 +63,7 @@ enum Command {
     },
 }
 
-pub fn server(receiver: Receiver<Command>) {
+fn server(receiver: Receiver<Command>) {
     let mut store = TicketStore::new();
     loop {
         match receiver.recv() {
diff --git a/exercises/07_threads/11_locks/src/lib.rs b/exercises/07_threads/11_locks/src/lib.rs
index b5e6c0da88..7a7db1ad65 100644
--- a/exercises/07_threads/11_locks/src/lib.rs
+++ b/exercises/07_threads/11_locks/src/lib.rs
@@ -60,7 +60,7 @@ enum Command {
     },
 }
 
-pub fn server(receiver: Receiver<Command>) {
+fn server(receiver: Receiver<Command>) {
     let mut store = TicketStore::new();
     loop {
         match receiver.recv() {
diff --git a/exercises/07_threads/12_rw_lock/src/lib.rs b/exercises/07_threads/12_rw_lock/src/lib.rs
index 0c33f539e5..a662dd4976 100644
--- a/exercises/07_threads/12_rw_lock/src/lib.rs
+++ b/exercises/07_threads/12_rw_lock/src/lib.rs
@@ -59,7 +59,7 @@ enum Command {
     },
 }
 
-pub fn server(receiver: Receiver<Command>) {
+fn server(receiver: Receiver<Command>) {
     let mut store = TicketStore::new();
     loop {
         match receiver.recv() {