diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index a970eaa625a..5d09e6b5103 100644
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+export TZ=UTC
 export LC_ALL=C
 set -e -o pipefail