diff --git a/src/Psalm/Internal/Analyzer/MethodAnalyzer.php b/src/Psalm/Internal/Analyzer/MethodAnalyzer.php
index 4da88b16f..ebe4b4b7e 100644
--- a/src/Psalm/Internal/Analyzer/MethodAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/MethodAnalyzer.php
@@ -857,6 +857,7 @@ class MethodAnalyzer extends FunctionLikeAnalyzer
                 && $guide_param->type
                 && !$guide_param->type->hasMixed()
                 && !$guide_param->type->from_docblock
+                && ($cased_guide_method_id !== 'SoapClient::__soapCall' || $implemeneter_param_type)
                 && (
                     !$implemeneter_param_type
                     || (
@@ -872,7 +873,7 @@ class MethodAnalyzer extends FunctionLikeAnalyzer
                 if (IssueBuffer::accepts(
                     new MethodSignatureMismatch(
                         'Argument ' . ($i + 1) . ' of ' . $cased_implementer_method_id . ' has wrong type \'' .
-                            $implementer_method_storage->params[$i]->type . '\', expecting \'' .
+                            $implemeneter_param_type . '\', expecting \'' .
                             $guide_param->type . '\' as defined by ' .
                             $cased_guide_method_id,
                         $implementer_method_storage->params[$i]->location
diff --git a/tests/MethodSignatureTest.php b/tests/MethodSignatureTest.php
index ede572064..3e10cffed 100644
--- a/tests/MethodSignatureTest.php
+++ b/tests/MethodSignatureTest.php
@@ -41,6 +41,32 @@ class MethodSignatureTest extends TestCase
                     ) {
                         return $_GET["foo"];
                     }
+                }
+
+                class B extends SoapClient
+                {
+                    public function __soapCall(
+                        $function_name,
+                        $arguments,
+                        $options = [],
+                        $input_headers = [],
+                        &$output_headers = []
+                    ) {
+                        return $_GET["foo"];
+                    }
+                }
+
+                class C extends SoapClient
+                {
+                    public function __soapCall(
+                        string $function_name,
+                        $arguments,
+                        $options = [],
+                        $input_headers = [],
+                        &$output_headers = []
+                    ) {
+                        return $_GET["foo"];
+                    }
                 }'
         );