diff --git a/python/testData/types/ImportedBoundMethodDecoratedWithParamSpec/mod.py b/python/testData/types/ImportedBoundMethodDecoratedWithParamSpec/mod.py
new file mode 100644
index 000000000000..9dbe75f88fb2
--- /dev/null
+++ b/python/testData/types/ImportedBoundMethodDecoratedWithParamSpec/mod.py
@@ -0,0 +1,11 @@
+from typing import Callable
+
+
+def outer_decorator[**P, T](f: Callable[P, T]) -> Callable[P, T]:
+    return f
+
+
+class NonWorkingClass:
+    @outer_decorator
+    def add_two(self, x: float, y: float) -> float:
+        return x + y
diff --git a/python/testSrc/com/jetbrains/python/PyTypingTest.java b/python/testSrc/com/jetbrains/python/PyTypingTest.java
index c75addb6c0ef..24946f5ccbb7 100644
--- a/python/testSrc/com/jetbrains/python/PyTypingTest.java
+++ b/python/testSrc/com/jetbrains/python/PyTypingTest.java
@@ -6808,6 +6808,34 @@ public class PyTypingTest extends PyTestCase {
       """);
   }
 
+  // PY-85027
+  public void testImportedBoundMethodDecoratedWithParamSpec() {
+    doMultiFileStubAwareTest("(x: float, y: float) -> float", """
+      from mod import NonWorkingClass
+      
+      expr = NonWorkingClass().add_two
+      """);
+  }
+
+  // PY-85027
+  public void testBoundMethodDecoratedWithParamSpec() {
+    doTest("(x: float, y: float) -> float", """
+      from typing import Callable
+      
+      def outer_decorator[**P, T](f: Callable[P, T]) -> Callable[P, T]:
+          return f
+      
+      
+      class NonWorkingClass:
+          @outer_decorator
+          def add_two(self, x: float, y: float) -> float:
+              return x + y
+      
+      
+      expr = NonWorkingClass().add_two
+      """);
+  }
+
   private void doTestNoInjectedText(@NotNull String text) {
     myFixture.configureByText(PythonFileType.INSTANCE, text);
     final InjectedLanguageManager languageManager = InjectedLanguageManager.getInstance(myFixture.getProject());
diff --git a/python/testSrc/com/jetbrains/python/inspections/Py3ArgumentListInspectionTest.java b/python/testSrc/com/jetbrains/python/inspections/Py3ArgumentListInspectionTest.java
index 4c724e00f462..0b1dda76eb05 100644
--- a/python/testSrc/com/jetbrains/python/inspections/Py3ArgumentListInspectionTest.java
+++ b/python/testSrc/com/jetbrains/python/inspections/Py3ArgumentListInspectionTest.java
@@ -644,4 +644,22 @@ public class Py3ArgumentListInspectionTest extends PyInspectionTestCase {
   public void testImportedDecoratedFunctionWithParamSpec() {
     doMultiFileTest();
   }
+
+  // PY-85027
+  public void testBoundMethodDecoratedWithParamSpec() {
+    doTestByText("""
+      from typing import Callable
+      
+      def outer_decorator[**P, T](f: Callable[P, T]) -> Callable[P, T]:
+          return f
+      
+      class NonWorkingClass:
+          @outer_decorator
+          def add_two(self, x: float, y: float) -> float:
+              return x + y
+      
+      
+      NonWorkingClass().add_two(<warning descr="Parameter 'x' unfilled"><warning descr="Parameter 'y' unfilled">)</warning></warning>
+      """);
+  }
 }