diff --git a/doc/tutorials/kvstore.md b/doc/tutorials/kvstore.md
index 76d416885..7464831b3 100644
--- a/doc/tutorials/kvstore.md
+++ b/doc/tutorials/kvstore.md
@@ -188,7 +188,7 @@ responding to messages using the `<-` reaction macro:
                     val)))
             (!!value val k))
           (catch (e)
-            (log-error "kvstore.get" e)
+            (errorf "kvstore.get ~a" e)
             (!!error (error-message e) k))))
 
         ((!kvstore.ref key k)
@@ -198,7 +198,7 @@ responding to messages using the `<-` reaction macro:
               (!!error "No object associated with key" k)
               (!!value val k)))
           (catch (e)
-            (log-error "kvstore.ref" e)
+            (errorf "kvstore.ref ~a" e)
             (!!error (error-message e) k))))
 
         ((!kvstore.put! key val k)
@@ -206,7 +206,7 @@ responding to messages using the `<-` reaction macro:
           (put! key val)
           (!!value (void) k)
           (catch (e)
-            (log-error "kvstore.put!" e)
+            (errorf "kvstore.put! ~a" e)
             (!!error (error-message e) k))))
 
         ((!kvstore.remove! key k)
@@ -214,7 +214,7 @@ responding to messages using the `<-` reaction macro:
           (remove! key)
           (!!value (void) k)
           (catch (e)
-            (log-error "kvstore.remove!" e)
+            (errorf "kvstore.remove! ~a" e)
             (!!error (error-message e) k))))
 
         (what
diff --git a/doc/tutorials/proxy.md b/doc/tutorials/proxy.md
index 740b024aa..bb3b7de97 100644
--- a/doc/tutorials/proxy.md
+++ b/doc/tutorials/proxy.md
@@ -78,7 +78,7 @@ For each connection, it logs it and spawns a thread to proxy it:
            (debug "Accepted connection from ~a" (socket-address->string caddr))
            (spawn proxy cli raddr)))
        (catch (e)
-         (log-error "Error accepting connection" e))))))
+         (errorf "Error accepting connection ~a" e))))))
 ```
 
 ### Connection proxying
@@ -102,7 +102,7 @@ mode.
        (spawn proxy-io clisock srvsock)
        (spawn proxy-io srvsock clisock)))
    (catch (e)
-     (log-error "Error creating proxy" e))))
+     (errorf "Error creating proxy ~a" e))))
 
 (def (proxy-io isock osock)
   (def buf (make-u8vector 4096))
@@ -132,7 +132,7 @@ mode.
                    (lp2 (fx+ start wr)))))
                (lp))))))))
    (catch (e)
-     (log-error "Error proxying connection" e)
+     (errorf "Error proxying connection ~a" e)
      (close-input-port isock)
      (close-output-port osock))))
 ```
@@ -210,7 +210,7 @@ address and then loops accepting connections to proxy:
          (debug "Accepted connection from ~a" (socket-address->string sa))
          (spawn proxy cli))
        (catch (e)
-         (log-error "Error accepting connection" e))))))
+         (errorf "Error accepting connection ~a" e))))))
 ```
 
 ### The proxy function
@@ -223,7 +223,7 @@ This procedure performs a handshake, establishing proxying according to the requ
      (spawn proxy-io clisock srvsock)
      (spawn proxy-io srvsock clisock))
    (catch (e)
-     (log-error "Error creating proxy" e))))
+     (errorf "Error creating proxy ~a" e))))
 ```
 
 The `proxy-handshake` function contains the details of the protocol implementation,
@@ -335,7 +335,7 @@ through the socket server:
          (ssocket-send-all osock buf 0 rd)
          (lp)))))
    (catch (e)
-     (log-error "Error proxying connection" e)
+     (errorf "Error proxying connection ~a" e)
      (ssocket-close-input isock)
      (ssocket-close-output osock #t))))
 ```
diff --git a/src/tutorial/kvstore/kvstored.ss b/src/tutorial/kvstore/kvstored.ss
index 03d0b8fc8..78ab26581 100644
--- a/src/tutorial/kvstore/kvstored.ss
+++ b/src/tutorial/kvstore/kvstored.ss
@@ -60,7 +60,7 @@
                     val)))
             (!!value val k))
           (catch (e)
-            (log-error "kvstore.get" e)
+            (errorf "kvstore.get ~a" e)
             (!!error (error-message e) k))))
 
         ((!kvstore.ref key k)
@@ -70,7 +70,7 @@
               (!!error "No object associated with key" k)
               (!!value val k)))
           (catch (e)
-            (log-error "kvstore.ref" e)
+            (errorf "kvstore.ref ~a" e)
             (!!error (error-message e) k))))
 
         ((!kvstore.put! key val k)
@@ -78,7 +78,7 @@
           (put! key val)
           (!!value (void) k)
           (catch (e)
-            (log-error "kvstore.put!" e)
+            (errorf "kvstore.put! ~a" e)
             (!!error (error-message e) k))))
 
         ((!kvstore.remove! key k)
@@ -86,7 +86,7 @@
           (remove! key)
           (!!value (void) k)
           (catch (e)
-            (log-error "kvstore.remove!" e)
+            (errorf "kvstore.remove! ~a" e)
             (!!error (error-message e) k))))
 
         (what
diff --git a/src/tutorial/proxy/socks-proxy.ss b/src/tutorial/proxy/socks-proxy.ss
index 8d2cd3329..3f7c476a9 100644
--- a/src/tutorial/proxy/socks-proxy.ss
+++ b/src/tutorial/proxy/socks-proxy.ss
@@ -19,7 +19,7 @@
          (debug "Accepted connection from ~a" (socket-address->string sa))
          (spawn proxy cli))
        (catch (e)
-         (log-error "Error accepting connection" e))))))
+         (errorf "Error accepting connection ~a" e))))))
 
 (def (proxy clisock)
   (try
@@ -27,7 +27,7 @@
      (spawn proxy-io clisock srvsock)
      (spawn proxy-io srvsock clisock))
    (catch (e)
-     (log-error "Error creating proxy" e))))
+     (errorf "Error creating proxy ~a" e))))
 
 ;;; SOCKS4
 ;; Request:
@@ -144,7 +144,7 @@
          (ssocket-send-all osock buf 0 rd)
          (lp)))))
    (catch (e)
-     (log-error "Error proxying connection" e)
+     (errorf "Error proxying connection ~a" e)
      (ssocket-close-input isock)
      (ssocket-close-output osock #t))))
 
diff --git a/src/tutorial/proxy/tcp-proxy.ss b/src/tutorial/proxy/tcp-proxy.ss
index 55a345f52..cb907e9d9 100644
--- a/src/tutorial/proxy/tcp-proxy.ss
+++ b/src/tutorial/proxy/tcp-proxy.ss
@@ -28,7 +28,7 @@
            (debug "Accepted connection from ~a" (socket-address->string caddr))
            (spawn proxy cli raddr)))
        (catch (e)
-         (log-error "Error accepting connection" e))))))
+         (errorf "Error accepting connection ~a" e))))))
 
 (def (proxy clisock raddr)
   (try
@@ -42,7 +42,7 @@
        (spawn proxy-io clisock srvsock)
        (spawn proxy-io srvsock clisock)))
    (catch (e)
-     (log-error "Error creating proxy" e))))
+     (errorf "Error creating proxy ~a" e))))
 
 (def (proxy-io isock osock)
   (def buf (make-u8vector 4096))
@@ -72,7 +72,7 @@
                    (lp2 (fx+ start wr)))))
                (lp))))))))
    (catch (e)
-     (log-error "Error proxying connection" e)
+     (errorf "Error proxying connection ~a" e)
      (close-input-port isock)
      (close-output-port osock))))