diff --git a/completion/available/gem.completion.bash b/completion/available/gem.completion.bash
index 8ce359f7..ab07a133 100644
--- a/completion/available/gem.completion.bash
+++ b/completion/available/gem.completion.bash
@@ -9,23 +9,26 @@ __gem_completion() {
 		install)
 			# list the remote gems and add to completion
 			if [ -z "$REMOTE_GEMS" ]; then
-				REMOTE_GEMS=($(gem list --remote --no-versions | sed 's/\*\*\* REMOTE GEMS \*\*\*//' | tr '\n' ' '))
+				read -r -a REMOTE_GEMS <<< "$(gem list --remote --no-versions | sed 's/\*\*\* REMOTE GEMS \*\*\*//' | tr '\n' ' ')"
 			fi
 
 			local cur=${COMP_WORDS[COMP_CWORD]}
+			# shellcheck disable=SC2207
 			COMPREPLY=($(compgen -W "${REMOTE_GEMS[*]}" -- "$cur"))
+			return 0
 			;;
 		uninstall)
 			# list all local installed gems and add to completion
-			if [ -z "$LOCAL_GEMS" ]; then
-				LOCAL_GEMS=($(gem list --no-versions | sed 's/\*\*\* LOCAL GEMS \*\*\*//' | tr '\n' ' '))
-			fi
+			read -r -a LOCAL_GEMS <<< "$(gem list --no-versions | sed 's/\*\*\* LOCAL GEMS \*\*\*//' | tr '\n' ' ')"
 
 			local cur=${COMP_WORDS[COMP_CWORD]}
+			# shellcheck disable=SC2207
 			COMPREPLY=($(compgen -W "${LOCAL_GEMS[*]}" -- "$cur"))
+			return 0
 			;;
 	esac
 	local commands=(build cert check cleanup contents dependency environment fetch generate_index help install list lock outdated owner pristine push query rdoc search server sources specification stale uninstall unpack update which)
+	# shellcheck disable=SC2207
 	COMPREPLY=($(compgen -W "${commands[*]}" -- "$cur"))
 }