diff --git a/completions/slapt-get b/completions/slapt-get
index 93d110bc..b94c1f0f 100644
--- a/completions/slapt-get
+++ b/completions/slapt-get
@@ -55,13 +55,13 @@ _slapt_get()
             # slapt-get will fail to search for "^name-version"
             # it can search for names only
             local name=${cur%%-*}
-            COMPREPLY=( $( slapt-get -c $config --search "^$name" 2>/dev/null |\
-                sed -ne "/^$cur/{s/ .*$//;p}" ) )
+            COMPREPLY=( $( LC_ALL=C "$1" -c "$config" --search "^$name" 2> \
+                /dev/null | LC_ALL=C sed -ne "/^$cur/{s/ .*$//;p}" ) )
             return
             ;;
         avl) # --install|-i|
-            COMPREPLY=( $( slapt-get -c $config --available 2>/dev/null | \
-                sed -ne "/^$cur/{s/ .*$//;p}" ) )
+            COMPREPLY=( $( LC_ALL=C "$1" -c "$config" --available 2> \
+                /dev/null | LC_ALL=C sed -ne "/^$cur/{s/ .*$//;p}" ) )
             return
             ;;
         ins) # --remove|--filelist
diff --git a/completions/slapt-src b/completions/slapt-src
index 9b6f5015..a3a646a9 100644
--- a/completions/slapt-src
+++ b/completions/slapt-src
@@ -49,11 +49,12 @@ _slapt_src()
     if [[ "$cur" == *:* ]]; then
         local name=${cur%:*}
         local version=${cur##*:}
-        COMPREPLY=( $( slapt-src --config "$config" --search "^$name" 2> \
-            /dev/null | sed -ne "/^$cur/{s/^$name:\([^ ]*\) .*$/\1/;p}" ) )
+        COMPREPLY=( $( LC_ALL=C "$1" --config "$config" --search "^$name" 2> \
+            /dev/null | LC_ALL=C sed -ne \
+            "/^$cur/{s/^$name:\([^ ]*\) .*$/\1/;p}" ) )
     else
-        COMPREPLY=( $( slapt-src --config "$config" --search "^$cur" 2> \
-            /dev/null | sed -ne "/^$cur/{s/ .*$//;p}" ) )
+        COMPREPLY=( $( LC_ALL=C "$1" --config "$config" --search "^$cur" 2> \
+            /dev/null | LC_ALL=C sed -ne "/^$cur/{s/ .*$//;p}" ) )
     fi
 } && complete -F _slapt_src slapt-src