diff --git a/guix-data-service/utils.scm b/guix-data-service/utils.scm
index 0250e42..ed13ef4 100644
--- a/guix-data-service/utils.scm
+++ b/guix-data-service/utils.scm
@@ -54,39 +54,38 @@
 
 
 (define* (make-thread-pool-channel #:key (threads 8))
-  (parameterize (((@@ (fibers internal) current-fiber) #f))
-    (let ((channel (make-channel)))
-      (for-each
-       (lambda _
-         (call-with-new-thread
-          (lambda ()
-            (let loop ()
-              (match (get-message channel)
-                (((? channel? reply) . (? procedure? proc))
-                 (put-message
-                  reply
-                  (with-exception-handler
-                      (lambda (exn)
-                        (cons 'worker-thread-error exn))
-                    (lambda ()
-                      (with-exception-handler
-                          (lambda (exn)
-                            (simple-format
-                             (current-error-port)
-                             "worker thread: exception: ~A\n"
-                             exn)
-                            (backtrace)
-                            (raise-exception exn))
-                        (lambda ()
-                          (call-with-values
-                              proc
-                            (lambda vals
-                              vals)))))
-                    #:unwind? #t))
-                 (loop))
-                (_ #f))))))
-       (iota threads))
-      channel)))
+  (let ((channel (make-channel)))
+    (for-each
+     (lambda _
+       (call-with-new-thread
+        (lambda ()
+          (let loop ()
+            (match (get-message channel)
+              (((? channel? reply) . (? procedure? proc))
+               (put-message
+                reply
+                (with-exception-handler
+                    (lambda (exn)
+                      (cons 'worker-thread-error exn))
+                  (lambda ()
+                    (with-exception-handler
+                        (lambda (exn)
+                          (simple-format
+                           (current-error-port)
+                           "worker thread: exception: ~A\n"
+                           exn)
+                          (backtrace)
+                          (raise-exception exn))
+                      (lambda ()
+                        (call-with-values
+                            proc
+                          (lambda vals
+                            vals)))))
+                  #:unwind? #t))
+               (loop))
+              (_ #f))))))
+     (iota threads))
+    channel))
 
 (define %thread-pool-mutex (make-mutex))
 (define %thread-pool-channel #f)
diff --git a/guix-dev.scm b/guix-dev.scm
index 436140d..394b873 100644
--- a/guix-dev.scm
+++ b/guix-dev.scm
@@ -51,7 +51,7 @@
      ("guile-email" ,guile-email)
      ("guile-json" ,guile-json-4)
      ("guile-squee" ,guile-squee)
-     ("guile-fibers" ,guile-fibers)
+     ("guile-fibers" ,guile-fibers-1.1)
      ("guile-gcrypt" ,guile-gcrypt)
      ("guile-lzlib" ,guile-lzlib)
      ("guile-readline" ,guile-readline)