diff --git a/gnu/packages/glib.scm b/gnu/packages/glib.scm
index 39b0a5f9e6..016fae11f1 100644
--- a/gnu/packages/glib.scm
+++ b/gnu/packages/glib.scm
@@ -184,9 +184,6 @@ (define glib
       (modify-phases %standard-phases
         (add-before 'build 'pre-build
           (lambda* (#:key inputs outputs #:allow-other-keys)
-            ;; For building deterministic pyc files
-            (setenv "DETERMINISTIC_BUILD" "1")
-
             ;; For tests/gdatetime.c.
             (setenv "TZDIR"
                     (string-append (assoc-ref inputs "tzdata")