diff --git a/src/Type/Php/NonEmptyStringFunctionsReturnTypeExtension.php b/src/Type/Php/NonEmptyStringFunctionsReturnTypeExtension.php
index 17d77f39e0..f4afe77ea8 100644
--- a/src/Type/Php/NonEmptyStringFunctionsReturnTypeExtension.php
+++ b/src/Type/Php/NonEmptyStringFunctionsReturnTypeExtension.php
@@ -17,6 +17,10 @@ class NonEmptyStringFunctionsReturnTypeExtension implements DynamicFunctionRetur
 	public function isFunctionSupported(FunctionReflection $functionReflection): bool
 	{
 		return in_array($functionReflection->getName(), [
+			'addslashes',
+			'addcslashes',
+			'escapeshellarg',
+			'escapeshellcmd',
 			'strtoupper',
 			'strtolower',
 			'mb_strtoupper',
diff --git a/tests/PHPStan/Analyser/data/non-empty-string.php b/tests/PHPStan/Analyser/data/non-empty-string.php
index a233259c5a..457229c9ba 100644
--- a/tests/PHPStan/Analyser/data/non-empty-string.php
+++ b/tests/PHPStan/Analyser/data/non-empty-string.php
@@ -305,6 +305,16 @@ class MoreNonEmptyStringFunctions
 	 */
 	public function doFoo(string $s, string $nonEmpty, int $i)
 	{
+		assertType('string', addslashes($s));
+		assertType('non-empty-string', addslashes($nonEmpty));
+		assertType('string', addcslashes($s));
+		assertType('non-empty-string', addcslashes($nonEmpty));
+		
+		assertType('string', escapeshellarg($s));
+		assertType('non-empty-string', escapeshellarg($nonEmpty));
+		assertType('string', escapeshellcmd($s));
+		assertType('non-empty-string', escapeshellcmd($nonEmpty));
+		
 		assertType('string', strtoupper($s));
 		assertType('non-empty-string', strtoupper($nonEmpty));
 		assertType('string', strtolower($s));