diff --git a/stubs/CoreGenericFunctions.phpstub b/stubs/CoreGenericFunctions.phpstub
index a03447b1f4b..5e2640e1a1f 100644
--- a/stubs/CoreGenericFunctions.phpstub
+++ b/stubs/CoreGenericFunctions.phpstub
@@ -627,12 +627,23 @@ function substr_replace($string, $replace, $offset, $length = null) {}
 
 /**
  * @psalm-pure
- *
  * @param string $haystack
- *
+ * @param string $needle
+ * @param int $offset
+ * @psalm-assert-if-true =non-empty-string $haystack
+ * @psalm-return positive-int|0|false
+ */
+function strpos(string $haystack, string $needle, int $offset = 0) {}
+
+/**
+ * @psalm-pure
+ * @param string $haystack
+ * @param string $needle
+ * @param int $offset
+ * @psalm-assert-if-true =non-empty-string $haystack
  * @psalm-return positive-int|0|false
  */
-function strpos($haystack, $needle, int $offset = 0) : int|false {}
+function stripos(string $haystack, string $needle, int $offset = 0) {}
 
 /**
  * @psalm-pure
diff --git a/tests/CoreStubsTest.php b/tests/CoreStubsTest.php
index 2eda2d93129..647675b7274 100644
--- a/tests/CoreStubsTest.php
+++ b/tests/CoreStubsTest.php
@@ -211,14 +211,39 @@ function after_str_ends_with(): string
                     }
                     throw new RuntimeException();
                 }
+
+                /** @return non-empty-string */
+                function after_strpos(): string
+                {
+                    $string = uniqid();
+                    if (strpos($string, "foo") !== false) {
+                        return $string;
+                    }
+                    throw new RuntimeException();
+                }
+
+                /** @return non-empty-string */
+                function after_stripos(): string
+                {
+                    $string = uniqid();
+                    if (stripos($string, "foo") !== false) {
+                        return $string;
+                    }
+                    throw new RuntimeException();
+                }
+
                 $a = after_str_contains();
                 $b = after_str_starts_with();
                 $c = after_str_ends_with();
+                $d = after_strpos();
+                $e = after_stripos();
             ',
             'assertions' => [
                 '$a===' => 'non-empty-string',
                 '$b===' => 'non-empty-string',
                 '$c===' => 'non-empty-string',
+                '$d===' => 'non-empty-string',
+                '$e===' => 'non-empty-string',
             ],
         ];
         yield "PHP8 str_* function doesn't subtract string after assertion" => [
diff --git a/tests/FunctionCallTest.php b/tests/FunctionCallTest.php
index efc037c758f..abc1703814c 100644
--- a/tests/FunctionCallTest.php
+++ b/tests/FunctionCallTest.php
@@ -598,12 +598,6 @@ function foo(string $a, string $b) : int {
                         return $aTime - $bTime;
                     }',
             ],
-            'strposIntSecondParam' => [
-                'code' => '<?php
-                    function hasZeroByteOffset(string $s) : bool {
-                        return strpos($s, 0) !== false;
-                    }',
-            ],
             'functionCallInGlobalScope' => [
                 'code' => '<?php
                     $a = function() use ($argv) : void {};',
@@ -3019,6 +3013,13 @@ function foo(callable $_a = "strlen"): void {}
                 ',
                 'error_message' => 'InvalidParamDefault',
             ],
+            'disallowStrposIntSecondParam' => [
+                'code' => '<?php
+                    function hasZeroByteOffset(string $s) : bool {
+                        return strpos($s, 0) !== false;
+                    }',
+                'error_message' => 'InvalidScalarArgument',
+            ],
         ];
     }