diff --git a/sys-kernel/gentoo-surface-sources/gentoo-surface-sources-5.13.7.ebuild b/sys-kernel/gentoo-surface-sources/gentoo-surface-sources-5.13.7.ebuild
index 53bc38a..1179422 100644
--- a/sys-kernel/gentoo-surface-sources/gentoo-surface-sources-5.13.7.ebuild
+++ b/sys-kernel/gentoo-surface-sources/gentoo-surface-sources-5.13.7.ebuild
@@ -30,9 +30,12 @@ SRC_URI="${KERNEL_URI} ${GENPATCHES_URI} ${ARCH_URI}
 "
 
 src_unpack() {
-	default
-	unpack_set_extraversion
-	}
+	if [[ -n ${A} ]]; then
+		unpack_set_extraversion
+	else
+		die
+		fi
+}
 
 src_prepare() {
 	local SURFACE_PATCH