diff --git a/rpm/kernel-binary.spec.in b/rpm/kernel-binary.spec.in
index 9be2051..2855f24 100644
--- a/rpm/kernel-binary.spec.in
+++ b/rpm/kernel-binary.spec.in
@@ -1114,14 +1114,14 @@ fi
 %endif
 %preun
 %if "%build_flavor" != "zfcpdump"
-/usr/lib/module-init-tools/kernel-scriptlets/rpm-preun --name "%name" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/rpm-preun --name "%name" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 %endif
 %postun
 %if "%build_flavor" != "zfcpdump"
-/usr/lib/module-init-tools/kernel-scriptlets/rpm-postun --name "%name" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/rpm-postun --name "%name" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
@@ -1178,13 +1178,13 @@ This package contains additional modules not supported by SUSE.
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 
 %preun extra
-/usr/lib/module-init-tools/kernel-scriptlets/inkmp-preun --name "%name-extra" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/inkmp-preun --name "%name-extra" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 
 %postun extra
-/usr/lib/module-init-tools/kernel-scriptlets/inkmp-postun --name "%name-extra" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/inkmp-postun --name "%name-extra" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
@@ -1242,13 +1242,13 @@ This package contains optional modules only for openSUSE Leap.
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 
 %preun optional
-/usr/lib/module-init-tools/kernel-scriptlets/inkmp-preun --name "%name-optional" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/inkmp-preun --name "%name-optional" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 
 %postun optional
-/usr/lib/module-init-tools/kernel-scriptlets/inkmp-postun --name "%name-optional" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/inkmp-postun --name "%name-optional" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
@@ -1409,13 +1409,13 @@ Requires(post): suse-module-tools >= 12.4
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 
 %preun -n @KMP_NAME@-%build_flavor
-/usr/lib/module-init-tools/kernel-scriptlets/inkmp-preun --name "@KMP_NAME@-%build_flavor" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/inkmp-preun --name "@KMP_NAME@-%build_flavor" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
 
 %postun -n @KMP_NAME@-%build_flavor
-/usr/lib/module-init-tools/kernel-scriptlets/inkmp-postun --name "@KMP_NAME@-%build_flavor" \
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/inkmp-postun --name "@KMP_NAME@-%build_flavor" \
   --version "%version" --release "%release" --kernelrelease "%kernelrelease" \
   --image "%image" --flavor "%build_flavor" --variant "%variant" \
   --usrmerged "0%{?usrmerged}" --certs "%certs" "$@"
diff --git a/rpm/kernel-cert-subpackage b/rpm/kernel-cert-subpackage
index 44aaa05..04a71b3 100644
--- a/rpm/kernel-cert-subpackage
+++ b/rpm/kernel-cert-subpackage
@@ -7,6 +7,15 @@ Requires(postun): suse-kernel-rpm-scriptlets
 This package contains the UEFI Secure Boot certificate used to sign
 modules in the %{-n*}-kmp packages.
 
+%define run_if_exists run_if_exists() { \
+if [ -x "$1" ] ; then                   \
+  "$@"                                  \
+else                                    \
+  echo Cannot execute "$1" >&2          \
+fi                                      \
+}                                       \
+run_if_exists
+
 %pre -n %{-n*}-ueficert
 /usr/lib/module-init-tools/kernel-scriptlets/cert-pre --certs "@CERTS@" "$@"
 
@@ -14,10 +23,10 @@ modules in the %{-n*}-kmp packages.
 /usr/lib/module-init-tools/kernel-scriptlets/cert-post --certs "@CERTS@" "$@"
 
 %preun -n %{-n*}-ueficert
-/usr/lib/module-init-tools/kernel-scriptlets/cert-preun --certs "@CERTS@" "$@"
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/cert-preun --certs "@CERTS@" "$@"
 
 %postun -n %{-n*}-ueficert
-/usr/lib/module-init-tools/kernel-scriptlets/cert-postun --certs "@CERTS@" "$@"
+%run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/cert-postun --certs "@CERTS@" "$@"
 
 %posttrans -n %{-n*}-ueficert
 /usr/lib/module-init-tools/kernel-scriptlets/cert-posttrans --certs "@CERTS@" "$@"
diff --git a/rpm/kernel-module-subpackage b/rpm/kernel-module-subpackage
index d00434f..6645965 100644
--- a/rpm/kernel-module-subpackage
+++ b/rpm/kernel-module-subpackage
@@ -48,6 +48,16 @@ Obsoletes: %{-n*}-kmp-xen
 Obsoletes: %{-n*}-kmp-desktop
 %endif
 AutoReqProv: on
+
+%define run_if_exists run_if_exists() { \
+if [ -x "$1" ] ; then                   \
+  "$@"                                  \
+else                                    \
+  echo Cannot execute "$1" >&2          \
+fi                                      \
+}                                       \
+run_if_exists
+
 %{-p:%{expand:%(cd %_sourcedir; cat %{-p*})}}
 %description -n %{-n*}-kmp-%1
 %(
@@ -80,11 +90,11 @@ END		{ exit(! good) }
   --version "%_this_kmp_version" --release "%{-r*}" --kernelrelease "%2" \
   --flavor "%1" --usrmerged "0%{?usrmerged}" "$@"
 %preun -n %{-n*}-kmp-%1
-%{-b:KMP_NEEDS_MKINITRD=1} /usr/lib/module-init-tools/kernel-scriptlets/kmp-preun --name "%{-n*}-kmp-%1" \
+%{-b:KMP_NEEDS_MKINITRD=1} %run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/kmp-preun --name "%{-n*}-kmp-%1" \
   --version "%_this_kmp_version" --release "%{-r*}" --kernelrelease "%2" \
   --flavor "%1" --usrmerged "0%{?usrmerged}" "$@"
 %postun -n %{-n*}-kmp-%1
-%{-b:KMP_NEEDS_MKINITRD=1} /usr/lib/module-init-tools/kernel-scriptlets/kmp-postun --name "%{-n*}-kmp-%1" \
+%{-b:KMP_NEEDS_MKINITRD=1} %run_if_exists /usr/lib/module-init-tools/kernel-scriptlets/kmp-postun --name "%{-n*}-kmp-%1" \
   --version "%_this_kmp_version" --release "%{-r*}" --kernelrelease "%2" \
   --flavor "%1" --usrmerged "0%{?usrmerged}" "$@"
 %posttrans -n %{-n*}-kmp-%1
diff --git a/rpm/kernel-spec-macros b/rpm/kernel-spec-macros
index 998b337..3f087e7 100644
--- a/rpm/kernel-spec-macros
+++ b/rpm/kernel-spec-macros
@@ -72,4 +72,14 @@
 %define kernel_module_directory /lib/modules
 %endif
 
+# Very basic macro for conditional execution.
+%define run_if_exists run_if_exists() { \
+if [ -x "$1" ] ; then                   \
+  "$@"                                  \
+else                                    \
+  echo Cannot execute "$1" >&2          \
+fi                                      \
+}                                       \
+run_if_exists
+
 # vim: ft=spec