diff --git a/htdocs/imports/import.php b/htdocs/imports/import.php
index 5b12c3757b1..01dafbd2e7d 100644
--- a/htdocs/imports/import.php
+++ b/htdocs/imports/import.php
@@ -1675,10 +1675,10 @@ if ($step == 4 && $datatoimport) {
 	print $langs->trans("ImportFromToLine");
 	print '</td><td>';
 	if ($action == 'launchsimu') {
-		print '<input type="number" class="maxwidth50 right valignmiddle" name="excludefirstlinebis" disabled="disabled" value="'.$excludefirstline.'">';
+		print '<input type="number" min="1" class="maxwidth50 right valignmiddle" name="excludefirstlinebis" disabled="disabled" value="'.$excludefirstline.'">';
 		print '<input type="hidden" name="excludefirstline" value="'.$excludefirstline.'">';
 	} else {
-		print '<input type="number" class="maxwidth50 right valignmiddle" name="excludefirstline" value="'.$excludefirstline.'">';
+		print '<input type="number" min="1" class="maxwidth50 right valignmiddle" name="excludefirstline" value="'.$excludefirstline.'">';
 		print $form->textwithpicto("", $langs->trans("SetThisValueTo2ToExcludeFirstLine"));
 	}
 	print ' - ';