diff --git a/ChangeLog b/ChangeLog
index 2e142c6..d3e7158 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,10 @@
 # Distributed under the GPL v2
 # $Id$
 
+  13 Oct 2012; Robin H. Johnson <robbat2@gentoo.org> gen_compile.sh:
+  Bug #397947: Run depmod on new modules to avoid need to run at every boot on
+  unionfs systems, or systemd that never runs it.
+
   13 Oct 2012; Robin H. Johnson <robbat2@gentoo.org> gen_initramfs.sh:
   Put the version of genkernel used in a build into /etc/build_id.
 
diff --git a/gen_compile.sh b/gen_compile.sh
index cbd3432..c923967 100755
--- a/gen_compile.sh
+++ b/gen_compile.sh
@@ -297,6 +297,8 @@ compile_modules() {
 	export UNAME_MACHINE="${ARCH}"
 	[ "${INSTALL_MOD_PATH}" != '' ] && export INSTALL_MOD_PATH
 	MAKEOPTS="${MAKEOPTS} -j1" compile_generic "modules_install" kernel
+	print_info 1 "        >> Generating module dependency data..."
+	depmod -a -e -b "${INSTALL_MOD_PATH}"/lib/modules/$KV ${KV}
 	unset UNAME_MACHINE
 }