diff --git a/src/Medoo.php b/src/Medoo.php
index 6d4bad89..bb5e1ebf 100644
--- a/src/Medoo.php
+++ b/src/Medoo.php
@@ -867,7 +867,7 @@ protected function dataImplode(array $data, array &$map, string $conjunctor): st
             $operator = $match['operator'] ?? null;
 
             if ($isIndex && isset($match[4]) && in_array($operator, ['>', '>=', '<', '<=', '=', '!='])) {
-                $stack[] = "${column} ${operator} " . $this->columnQuote($match[4]);
+                $stack[] = "{$column} {$operator} " . $this->columnQuote($match[4]);
                 continue;
             }
 
@@ -1318,7 +1318,7 @@ protected function buildJoin(string $table, array $join, array &$map): string
                 $tableName .= ' AS ' . $this->tableQuote($match['alias']);
             }
 
-            $tableJoin[] = $type[$match['join']] . " JOIN ${tableName} ${relation}";
+            $tableJoin[] = $type[$match['join']] . " JOIN {$tableName} {$relation}";
         }
 
         return implode(' ', $tableJoin);