diff --git a/packages/linux-airgap/Containerfile b/packages/linux-airgap/Containerfile
index 7842ea3..ed3872a 100644
--- a/packages/linux-airgap/Containerfile
+++ b/packages/linux-airgap/Containerfile
@@ -37,9 +37,10 @@ COPY --from=stagex/bash /bin/bash /bin/sh
 RUN tar -xf ${SRC_FILE}
 WORKDIR /linux-${VERSION}
 ADD linux.config .config
+ENV SOURCE_DATE_EPOCH=1
 ENV KBUILD_BUILD_HOST=stagex
 ENV KBUILD_BUILD_USER=user
-ENV KBUILD_BUILD_TIMESTAMP=1
+ENV KBUILD_BUILD_TIMESTAMP="Thu Jan  1 12:00:00 AM GMT 1970"
 RUN <<-EOF
 	set -eux
 	make -j "$(nproc)" bzImage
diff --git a/packages/linux-generic/Containerfile b/packages/linux-generic/Containerfile
index 1996072..472b9e0 100644
--- a/packages/linux-generic/Containerfile
+++ b/packages/linux-generic/Containerfile
@@ -36,9 +36,10 @@ COPY --from=stagex/bash . /
 COPY --from=stagex/bash /bin/bash /bin/sh
 RUN tar -xf ${SRC_FILE}
 WORKDIR /linux-${VERSION}
+ENV SOURCE_DATE_EPOCH=1
 ENV KBUILD_BUILD_HOST=stagex
 ENV KBUILD_BUILD_USER=user
-ENV KBUILD_BUILD_TIMESTAMP=1
+ENV KBUILD_BUILD_TIMESTAMP="Thu Jan  1 12:00:00 AM GMT 1970"
 RUN <<-EOF
 	set -eux
 	unsetConfs='
diff --git a/packages/linux-guest/Containerfile b/packages/linux-guest/Containerfile
index 7842ea3..ed3872a 100644
--- a/packages/linux-guest/Containerfile
+++ b/packages/linux-guest/Containerfile
@@ -37,9 +37,10 @@ COPY --from=stagex/bash /bin/bash /bin/sh
 RUN tar -xf ${SRC_FILE}
 WORKDIR /linux-${VERSION}
 ADD linux.config .config
+ENV SOURCE_DATE_EPOCH=1
 ENV KBUILD_BUILD_HOST=stagex
 ENV KBUILD_BUILD_USER=user
-ENV KBUILD_BUILD_TIMESTAMP=1
+ENV KBUILD_BUILD_TIMESTAMP="Thu Jan  1 12:00:00 AM GMT 1970"
 RUN <<-EOF
 	set -eux
 	make -j "$(nproc)" bzImage
diff --git a/packages/linux-nitro/Containerfile b/packages/linux-nitro/Containerfile
index 130a13f..ed2b452 100644
--- a/packages/linux-nitro/Containerfile
+++ b/packages/linux-nitro/Containerfile
@@ -44,9 +44,10 @@ RUN tar -xf ${NSM_SRC_FILE} -C nitro-bootstrap --strip-components 1
 RUN tar -xf ${SRC_FILE}
 WORKDIR /linux-${VERSION}
 ADD linux.config .config
+ENV SOURCE_DATE_EPOCH=1
 ENV KBUILD_BUILD_HOST=stagex
 ENV KBUILD_BUILD_USER=user
-ENV KBUILD_BUILD_TIMESTAMP=1
+ENV KBUILD_BUILD_TIMESTAMP="Thu Jan  1 12:00:00 AM GMT 1970"
 RUN <<-EOF
 	set -eux
 	make olddefconfig