diff --git a/completions/ant b/completions/ant
index 2af0bdc8..e174c17b 100644
--- a/completions/ant
+++ b/completions/ant
@@ -59,7 +59,7 @@ _ant()
 } &&
 complete -F _ant ant phing
 type complete-ant-cmd.pl &>/dev/null && \
-    complete -C complete-ant-cmd.pl -F _ant ant
+    complete -C complete-ant-cmd.pl -F _ant ant || :
 
 # Local variables:
 # mode: shell-script
diff --git a/completions/gcc b/completions/gcc
index dfc8a172..5fe9c415 100644
--- a/completions/gcc
+++ b/completions/gcc
@@ -48,7 +48,7 @@ _gcc()
 complete -F _gcc gcc g++ c++ g77 gcj gpc
 
 [[ $OSTYPE == *cygwin* || $( _userland ) == GNU ]] \
-    && _have gcc && complete -F _gcc cc
+    && _have gcc && complete -F _gcc cc || :
 
 # Local variables:
 # mode: shell-script
diff --git a/completions/killall b/completions/killall
index d57165fc..8d05d132 100644
--- a/completions/killall
+++ b/completions/killall
@@ -14,7 +14,7 @@ _killall()
     return 0
 } &&
 complete -F _killall pkill
-[[ $OSTYPE == *@(linux|freebsd|darwin)* ]] && complete -F _killall killall
+[[ $OSTYPE == *@(linux|freebsd|darwin)* ]] && complete -F _killall killall || :
 
 # Local variables:
 # mode: shell-script