diff --git a/app/code/Magento/ImportExport/Model/Import/AbstractEntity.php b/app/code/Magento/ImportExport/Model/Import/AbstractEntity.php
index 8a95b2815eb85..fe7d1692c4a16 100644
--- a/app/code/Magento/ImportExport/Model/Import/AbstractEntity.php
+++ b/app/code/Magento/ImportExport/Model/Import/AbstractEntity.php
@@ -803,7 +803,7 @@ public function validateData()
                 if (!$this->isAttributeParticular($columnName)) {
                     if (trim($columnName) == '') {
                         $emptyHeaderColumns[] = $columnNumber;
-                    } elseif (!preg_match('/^[a-z][a-z0-9_]*$/', $columnName)) {
+                    } elseif (!preg_match('/^[a-z][\w]*$/u', $columnName)) {
                         $invalidColumns[] = $columnName;
                     } elseif ($this->needColumnCheck && !in_array($columnName, $this->getValidColumnNames())) {
                         $invalidAttributes[] = $columnName;
diff --git a/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php b/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php
index 47b0935e31470..3e9e239b3b05f 100644
--- a/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php
+++ b/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php
@@ -769,7 +769,7 @@ public function validateData()
                     if (!$this->isAttributeParticular($columnName)) {
                         if (trim($columnName) == '') {
                             $emptyHeaderColumns[] = $columnNumber;
-                        } elseif (!preg_match('/^[a-z][a-z0-9_]*$/', $columnName)) {
+                        } elseif (!preg_match('/^[a-z][\w]*$/u', $columnName)) {
                             $invalidColumns[] = $columnName;
                         } elseif ($this->needColumnCheck && !in_array($columnName, $this->getValidColumnNames())) {
                             $invalidAttributes[] = $columnName;