diff --git a/completion/bash/is b/completion/bash/is
index 9fcb82219bea59a84f1ae601bd73a19dde830c0f..b96ff4e1696a5995c3065f569428815410bf090f 100644
--- a/completion/bash/is
+++ b/completion/bash/is
@@ -15,17 +15,17 @@
 
 # list local repositories
 _local_repo() {
-   COMPREPLY=("${COMPREPLY[@]}" $(compgen -W "$(is --quiet --no-color --no-sync repo --local)"  -- "$cur"))
+   COMPREPLY=("${COMPREPLY[@]}" $(compgen -W "$(is --quiet --no-color --no-sync repo --local 2>/dev/null)"  -- "$cur"))
 }
 
 # list all defined repositories
 _repo() {
-   COMPREPLY=("${COMPREPLY[@]}" $(compgen -W "$(is --quiet --no-color --no-sync repo)"  -- "$cur"))
+   COMPREPLY=("${COMPREPLY[@]}" $(compgen -W "$(is --quiet --no-color --no-sync repo 2>/dev/null)"  -- "$cur"))
 }
 
 # list all images available in any online repositories
 _remote_image() {
-   COMPREPLY=("${COMPREPLY[@]}" $(compgen -W "$(is --quiet --no-color --no-sync list '*/*:*')" -- "$cur"))
+   COMPREPLY=("${COMPREPLY[@]}" $(compgen -W "$(is --quiet --no-color --no-sync list '*/*:*' 2>/dev/null)" -- "$cur"))
 }
 
 # list all local (files) images
diff --git a/completion/zsh/_installsystems b/completion/zsh/_installsystems
index 59a47bbeb517c88c0da6f8b51e9deb02a714ed2a..66158657fd108203e5398cf55c62a8de22b4531f 100644
--- a/completion/zsh/_installsystems
+++ b/completion/zsh/_installsystems
@@ -20,7 +20,7 @@
 (( $+functions[_installsystems_local_repo] )) ||
 _installsystems_local_repo() {
     local repos expl
-    repos=($(_call_program options is --quiet --no-color --no-sync repo --local))
+    repos=($(_call_program options is --quiet --no-color --no-sync repo --local 2>/dev/null))
     _wanted list expl 'local repo' compadd ${expl} - ${repos}
 }
 
@@ -28,7 +28,7 @@ _installsystems_local_repo() {
 (( $+functions[_installsystems_repo] )) ||
 _installsystems_repo() {
     local repos expl
-    repos=($(_call_program options is --quiet --no-color --no-sync repo))
+    repos=($(_call_program options is --quiet --no-color --no-sync repo 2>/dev/null))
     _wanted list expl 'repo' compadd ${expl} - ${repos}
 }
 
@@ -36,7 +36,7 @@ _installsystems_repo() {
 (( $+functions[_installsystems_remote_images] )) ||
 _installsystems_remote_images() {
     local images expl
-    images=($(_call_program options is --quiet --no-color --no-sync list "'*/*:*'"))
+    images=($(_call_program options is --quiet --no-color --no-sync list "'*/*:*'" 2>/dev/null))
     _wanted list expl 'remote image' compadd ${expl} - ${images}
 }
 
@@ -44,8 +44,8 @@ _installsystems_remote_images() {
 (( $+functions[_installsystems_local_images] )) ||
 _installsystems_local_images() {
     local localrepos expl images
-    localrepos=${(j:,:)${$(_call_program options is --quiet --no-color --no-sync repo --local)}}
-    images=($(_call_program options is --quiet --no-color --no-sync -s ${localrepos} -f ${localrepos} list "'*/*:*'"))
+    localrepos=${(j:,:)${$(_call_program options is --quiet --no-color --no-sync repo --local 2>/dev/null)}}
+    images=($(_call_program options is --quiet --no-color --no-sync -s ${localrepos} -f ${localrepos} list "'*/*:*'" 2>/dev/null))
     _wanted list expl 'local image' compadd ${expl} - ${images}
 }