diff --git a/boot/barebox/barebox.mk b/boot/barebox/barebox.mk
index a0cfaffe09..d7bcafe436 100644
--- a/boot/barebox/barebox.mk
+++ b/boot/barebox/barebox.mk
@@ -78,7 +78,7 @@ ifeq ($$(BR2_REPRODUCIBLE),y)
 $(1)_MAKE_ENV += \
 	KBUILD_BUILD_USER=buildroot \
 	KBUILD_BUILD_HOST=buildroot \
-	KBUILD_BUILD_TIMESTAMP="$$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
+	KBUILD_BUILD_TIMESTAMP="$$(shell LC_ALL=C TZ='UTC' date -d @$(SOURCE_DATE_EPOCH))"
 endif
 
 ifeq ($$(BR2_TARGET_$(1)_USE_DEFCONFIG),y)