diff --git a/src/chat.c b/src/chat.c
index 6dafd9e..4c8bbc7 100644
--- a/src/chat.c
+++ b/src/chat.c
@@ -923,7 +923,10 @@ static void chat_onDraw(ToxWindow *self, Tox *m)
 
     ChatContext *ctx = self->chatwin;
 
+    pthread_mutex_lock(&Winthread.lock);
     line_info_print(self);
+    pthread_mutex_unlock(&Winthread.lock);
+
     wclear(ctx->linewin);
 
     curs_set(1);
diff --git a/src/groupchat.c b/src/groupchat.c
index ec97ebb..8423497 100644
--- a/src/groupchat.c
+++ b/src/groupchat.c
@@ -656,7 +656,10 @@ static void groupchat_onDraw(ToxWindow *self, Tox *m)
 
     ChatContext *ctx = self->chatwin;
 
+    pthread_mutex_lock(&Winthread.lock);
     line_info_print(self);
+    pthread_mutex_unlock(&Winthread.lock);
+
     wclear(ctx->linewin);
 
     curs_set(1);
diff --git a/src/prompt.c b/src/prompt.c
index 355d0d3..a3d2901 100644
--- a/src/prompt.c
+++ b/src/prompt.c
@@ -254,7 +254,10 @@ static void prompt_onDraw(ToxWindow *self, Tox *m)
 
     ChatContext *ctx = self->chatwin;
 
+    pthread_mutex_lock(&Winthread.lock);
     line_info_print(self);
+    pthread_mutex_unlock(&Winthread.lock);
+
     wclear(ctx->linewin);
 
     curs_set(1);
diff --git a/src/windows.c b/src/windows.c
index 4075371..f50ff10 100644
--- a/src/windows.c
+++ b/src/windows.c
@@ -561,8 +561,11 @@ void refresh_inactive_windows(void)
     for (i = 0; i < MAX_WINDOWS_NUM; ++i) {
         ToxWindow *a = &windows[i];
 
-        if (a->active && a != active_window && !a->is_friendlist)
+        if (a->active && a != active_window && !a->is_friendlist) {
+            pthread_mutex_lock(&Winthread.lock);
             line_info_print(a);
+            pthread_mutex_unlock(&Winthread.lock);
+        }
     }
 }