diff --git a/Helper/QuestionHelper.php b/Helper/QuestionHelper.php
index c74620dab..faf2648bd 100644
--- a/Helper/QuestionHelper.php
+++ b/Helper/QuestionHelper.php
@@ -230,7 +230,7 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
             } elseif ("\177" === $c) { // Backspace Character
                 if (0 === $numMatches && 0 !== $i) {
                     --$i;
-                    $fullChoice = self::substr($fullChoice, 0, -1);
+                    $fullChoice = self::substr($fullChoice, 0, $i);
                     // Move cursor backwards
                     $output->write("\033[1D");
                 }
@@ -286,6 +286,8 @@ function ($match) use ($ret) {
                         $output->write($c);
                         break;
                     }
+
+                    $numMatches = 0;
                 }
 
                 continue;
diff --git a/Tests/Helper/QuestionHelperTest.php b/Tests/Helper/QuestionHelperTest.php
index 652c4184b..fcba3b3b2 100644
--- a/Tests/Helper/QuestionHelperTest.php
+++ b/Tests/Helper/QuestionHelperTest.php
@@ -194,7 +194,7 @@ public function testAskWithAutocomplete()
         // <DOWN ARROW><NEWLINE>
         // S<BACKSPACE><BACKSPACE><DOWN ARROW><DOWN ARROW><NEWLINE>
         // F00<BACKSPACE><BACKSPACE>oo<TAB><NEWLINE>
-        // F⭐<TAB><BACKSPACE><BACKSPACE>⭐<TAB><NEWLINE>
+        // F⭐<TAB><BACKSPACE><BACKSPACE>⭐<TAB><NEWLINE>
         $inputStream = $this->getInputStream("Acm\nAc\177\177s\tTest\n\n\033[A\033[A\033[A\n\033[A\033[A\033[A\033[A\033[A\033[A\033[A\tTest\n\033[B\nS\177\177\033[B\033[B\nF00\177\177oo\t\nF⭐\t\177\177⭐\t\n");
 
         $dialog = new QuestionHelper();
@@ -774,7 +774,7 @@ public function testTraversableMultiselectAutocomplete()
         // F00<BACKSPACE><BACKSPACE>o<TAB>,A<DOWN ARROW>,<SPACE>SecurityBundle<NEWLINE>
         // Acme<TAB>,<SPACE>As<TAB><29x BACKSPACE>S<TAB><NEWLINE>
         // Ac<TAB>,As<TAB><3x BACKSPACE>d<TAB><NEWLINE>
-        $inputStream = $this->getInputStream("\nF\t\nA\033[A\033[A\033[A\t,F\t\nF00\177\177o\t,A\033[B\t, SecurityBundle\nSecurityBundle\nAcme\t, As\t\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177S\t\nAc\t,As\t\177\177\177d\t\n");
+        $inputStream = $this->getInputStream("\nF\t\nA\033[A\033[A\033[A\t,F\t\nF00\177\177o\t,A\033[B\t, SecurityBundle\nAcme\t, As\t\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177\177S\t\nAc\t,As\t\177\177\177d\t\n");
 
         $dialog = new QuestionHelper();
         $helperSet = new HelperSet([new FormatterHelper()]);