diff --git a/sys-fs/zfs/zfs-2.4.3.ebuild b/sys-fs/zfs/zfs-2.4.3.ebuild
index e9bbe78235e81..274e57f560d11 100644
--- a/sys-fs/zfs/zfs-2.4.3.ebuild
+++ b/sys-fs/zfs/zfs-2.4.3.ebuild
@@ -225,6 +225,9 @@ src_prepare() {
 	# Run unconditionally (bug #792627)
 	eautoreconf
 
+	# strip forced -Werror, #904378
+	sed -i '/BUILD_FREEBSD_TRUE/s/-Werror //g' Makefile.in || die
+
 	if [[ ${PV} != "9999" ]]; then
 		# Set revision number
 		sed -i "s/\(Release:\)\(.*\)1/\1\2${PR}-gentoo/" META || die "Could not set Gentoo release"
diff --git a/sys-fs/zfs/zfs-9999.ebuild b/sys-fs/zfs/zfs-9999.ebuild
index c85ca6fef7a5f..0c2f1d54a8bf9 100644
--- a/sys-fs/zfs/zfs-9999.ebuild
+++ b/sys-fs/zfs/zfs-9999.ebuild
@@ -226,6 +226,9 @@ src_prepare() {
 	# Run unconditionally (bug #792627)
 	eautoreconf
 
+	# strip forced -Werror, #904378
+	sed -i '/BUILD_FREEBSD_TRUE/s/-Werror //g' Makefile.in || die
+
 	if [[ ${PV} != "9999" ]]; then
 		# Set revision number
 		sed -i "s/\(Release:\)\(.*\)1/\1\2${PR}-gentoo/" META || die "Could not set Gentoo release"