diff --git a/update-rates b/update-rates
index a3e9f46..e70b892 100755
--- a/update-rates
+++ b/update-rates
@@ -30,7 +30,7 @@ last_date="$(tail -n1 "$pricedb" | sed 's/P \([0-9 :-]*\) .*/\1/')"
 printf 'Fetching all exchange rates after %s\n' "$last_date"
 
 values="$(ssh $SSHARGS "$SERVERSIDE_PATH_TO_RATES '$last_date' $SYMBOLS")"
-if [ $? -eq 0 -a -n "$values" ]; then
+if [ $? -eq 0 ] && [ -n "$values" ]; then
 	printf '%s\n' "$values" >> "$pricedb"
 	printf '%s\n' "$values"
 fi