diff --git a/deploy/ssh.sh b/deploy/ssh.sh
index b4a8140e..3424055f 100644
--- a/deploy/ssh.sh
+++ b/deploy/ssh.sh
@@ -237,8 +237,8 @@ then rm -rf \"\$fn\"; echo \"Backup \$fn deleted as older than 180 days\"; fi; d
       # if filename is same as previous file then append.
       _pipe=">>"
       _local_cert_file=$(_mktemp)
-      cat $_ckey > $_local_cert_file
-      cat $_ccert >> $_local_cert_file
+      cat "$_ckey" > "$_local_cert_file"
+      cat "$_ccert" >> "$_local_cert_file"
     elif [ "$Le_Deploy_ssh_backup" = "yes" ]; then
       # backup file we are about to overwrite.
       _cmdstr="$_cmdstr cp $Le_Deploy_ssh_certfile $_backupdir >/dev/null;"
@@ -344,15 +344,15 @@ then rm -rf \"\$fn\"; echo \"Backup \$fn deleted as older than 180 days\"; fi; d
       _pipe=">>"
       _local_full_file=$(_mktemp)
       if [ "$Le_Deploy_ssh_fullchain" = "$Le_Deploy_ssh_keyfile" ] ; then
-        cat $_ckey >> $_local_full_file
+        cat "$_ckey" >> "$_local_full_file"
       fi
       if [ "$Le_Deploy_ssh_fullchain" = "$Le_Deploy_ssh_certfile" ]; then
-        cat $_ccert >> $_local_full_file
+        cat "$_ccert" >> "$_local_full_file"
       fi
       if [ "$Le_Deploy_ssh_fullchain" = "$Le_Deploy_ssh_cafile" ]; then
-        cat $_cca >> $_local_full_file
+        cat "$_cca" >> "$_local_full_file"
       fi
-      cat $_cfullchain >> $_local_full_file
+      cat "$_cfullchain" >> "$_local_full_file"
 
     elif [ "$Le_Deploy_ssh_backup" = "yes" ]; then
       # backup file we are about to overwrite.
@@ -390,13 +390,13 @@ then rm -rf \"\$fn\"; echo \"Backup \$fn deleted as older than 180 days\"; fi; d
   # cleanup local files if any
 
   if [ -n "$_local_cert_file" ]; then
-    rm $_local_cert_file > /dev/null 1>&2
+    rm "$_local_cert_file" > /dev/null 1>&2
   fi
   if [ -n "$_local_ca_file" ]; then
-    rm $_local_ca_file > /dev/null 1>&2
+    rm "$_local_ca_file" > /dev/null 1>&2
   fi
   if [ -n "$_local_full_file" ]; then
-    rm $_local_full_file > /dev/null 1>&2
+    rm "$_local_full_file" > /dev/null 1>&2
   fi