diff --git a/packages/pyright-internal/src/analyzer/constraintSolver.ts b/packages/pyright-internal/src/analyzer/constraintSolver.ts
index 2998dc6900be..1dbc202d9f5f 100644
--- a/packages/pyright-internal/src/analyzer/constraintSolver.ts
+++ b/packages/pyright-internal/src/analyzer/constraintSolver.ts
@@ -143,7 +143,7 @@ export function assignTypeToTypeVar(
 
         // Emit an error unless this is a synthesized type variable used
         // for pseudo-generic classes.
-        if (!destType.details.isSynthesized && !destType.details.isSynthesizedSelf) {
+        if (!destType.details.isSynthesized || destType.details.isSynthesizedSelf) {
             diag?.addMessage(
                 Localizer.DiagnosticAddendum.typeAssignmentMismatch().format(
                     evaluator.printSrcDestTypes(srcType, destType)
diff --git a/packages/pyright-internal/src/tests/samples/paramSpec41.py b/packages/pyright-internal/src/tests/samples/paramSpec41.py
index 8226a4224de7..db20eadbc0ab 100644
--- a/packages/pyright-internal/src/tests/samples/paramSpec41.py
+++ b/packages/pyright-internal/src/tests/samples/paramSpec41.py
@@ -10,7 +10,7 @@ class A:
     def __init__(self, x: int, y: int, z: str) -> None:
         self.a = x
 
-    # This should generate an error.
+    # This should generate two errors.
     @classmethod
     def f(cls: Callable[P, Self], *args: P.args, **kwargs: P.kwargs) -> int:
         return cls(*args, **kwargs).a
diff --git a/packages/pyright-internal/src/tests/samples/self10.py b/packages/pyright-internal/src/tests/samples/self10.py
new file mode 100644
index 000000000000..6cdda68e82a6
--- /dev/null
+++ b/packages/pyright-internal/src/tests/samples/self10.py
@@ -0,0 +1,16 @@
+# This sample tests that a class is not assignable to Self@Class.
+
+from typing import Self
+
+
+class A:
+    def self_arg(self, other: Self):
+        ...
+
+    def call_self_arg(self):
+        # This should generate an error.
+        self.self_arg(A())
+
+    def get_instance(self) -> Self:
+        # This should generate an error.
+        return A()
diff --git a/packages/pyright-internal/src/tests/typeEvaluator1.test.ts b/packages/pyright-internal/src/tests/typeEvaluator1.test.ts
index e5069b88bc23..3fefcbd100e4 100644
--- a/packages/pyright-internal/src/tests/typeEvaluator1.test.ts
+++ b/packages/pyright-internal/src/tests/typeEvaluator1.test.ts
@@ -1482,6 +1482,12 @@ test('Self9', () => {
     TestUtils.validateResults(analysisResults, 0);
 });
 
+test('Self10', () => {
+    const analysisResults = TestUtils.typeAnalyzeSampleFiles(['self10.py']);
+
+    TestUtils.validateResults(analysisResults, 2);
+});
+
 test('UnusedVariable1', () => {
     const configOptions = new ConfigOptions('.');
 
diff --git a/packages/pyright-internal/src/tests/typeEvaluator4.test.ts b/packages/pyright-internal/src/tests/typeEvaluator4.test.ts
index 0824c70c0c04..558528445297 100644
--- a/packages/pyright-internal/src/tests/typeEvaluator4.test.ts
+++ b/packages/pyright-internal/src/tests/typeEvaluator4.test.ts
@@ -1052,7 +1052,7 @@ test('ParamSpec40', () => {
 
 test('ParamSpec41', () => {
     const results = TestUtils.typeAnalyzeSampleFiles(['paramSpec41.py']);
-    TestUtils.validateResults(results, 1);
+    TestUtils.validateResults(results, 2);
 });
 
 test('ParamSpec42', () => {