diff --git a/src/Codeception/Lib/Driver/PostgreSql.php b/src/Codeception/Lib/Driver/PostgreSql.php
index 45bed775..3d0818eb 100644
--- a/src/Codeception/Lib/Driver/PostgreSql.php
+++ b/src/Codeception/Lib/Driver/PostgreSql.php
@@ -164,7 +164,7 @@ public function getPrimaryKey(string $tableName): array
                 FROM   pg_index i
                 JOIN   pg_attribute a ON a.attrelid = i.indrelid
                                      AND a.attnum = ANY(i.indkey)
-                WHERE  i.indrelid = '{$tableName}'::regclass
+                WHERE  i.indrelid = '\"{$tableName}\"'::regclass
                 AND    i.indisprimary";
             $stmt = $this->executeQuery($query, []);
             $columns = $stmt->fetchAll(PDO::FETCH_ASSOC);
diff --git a/tests/data/dumps/postgres.sql b/tests/data/dumps/postgres.sql
index 13b87d0e..30af3596 100755
--- a/tests/data/dumps/postgres.sql
+++ b/tests/data/dumps/postgres.sql
@@ -448,6 +448,10 @@ CREATE TABLE "no_pk" (
     "status" VARCHAR NOT NULL
 );
 
+CREATE TABLE "NoPk" (
+    "Status" VARCHAR NOT NULL
+);
+
 CREATE TABLE "order" (
     "id" INTEGER NOT NULL PRIMARY KEY,
     "name" VARCHAR NOT NULL,
diff --git a/tests/unit/Codeception/Module/Db/PostgreSqlDbTest.php b/tests/unit/Codeception/Module/Db/PostgreSqlDbTest.php
index 0f2c4900..ee2f8396 100644
--- a/tests/unit/Codeception/Module/Db/PostgreSqlDbTest.php
+++ b/tests/unit/Codeception/Module/Db/PostgreSqlDbTest.php
@@ -33,4 +33,10 @@ public function getConfig(): array
             'populate' => true
         ];
     }
+
+    public function testHaveInDatabaseWithUppercaseTableName()
+    {
+        $testData = ['Status' => 'test'];
+        $this->module->haveInDatabase('NoPk', $testData);
+    }
 }