diff --git a/lib/Controller/ApiController.php b/lib/Controller/ApiController.php
index 16ac98a72..b5b2d89da 100644
--- a/lib/Controller/ApiController.php
+++ b/lib/Controller/ApiController.php
@@ -1846,7 +1846,7 @@ private function storeAnswersForQuestion(Form $form, $submissionId, array $quest
 				if ($optionIndex !== false) {
 					$answerText = $question['options'][$optionIndex]['text'];
 				} elseif (!empty($question['extraSettings']['allowOtherAnswer']) && str_starts_with($answer, Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX)) {
-					$answerText = str_replace(Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX, '', $answer);
+					$answerText = substr($answer, strlen(Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX));
 				}
 			} elseif ($question['type'] === Constants::ANSWER_TYPE_FILE) {
 				$uploadedFile = $this->uploadedFileMapper->getForSubmission(
diff --git a/tests/Unit/Controller/ApiControllerTest.php b/tests/Unit/Controller/ApiControllerTest.php
index 6b9af0231..d6bb37be5 100644
--- a/tests/Unit/Controller/ApiControllerTest.php
+++ b/tests/Unit/Controller/ApiControllerTest.php
@@ -791,7 +791,7 @@ public function testNewSubmission_answers() {
 
 		$answers = [
 			1 => ['3'],
-			2 => ['2', '5', Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX . 'other answer'],
+			2 => ['2', '5', Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX . 'other answer ' . Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX],
 			3 => ['short anwer'],
 			4 => [['uploadedFileId' => 100, 'uploadToken' => 'valid-upload-token']],
 			5 => ['ignore unknown question'],
@@ -830,7 +830,7 @@ public function testNewSubmission_answers() {
 						}
 						break;
 					case 2:
-						if (!in_array($answer->getText(), ['other answer', 'test id 2'])) {
+						if (!in_array($answer->getText(), ['other answer ' . Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX, 'test id 2'], true)) {
 							return false;
 						}
 						break;