diff --git a/pkg/analyzer/analyzer.go b/pkg/analyzer/analyzer.go
index 5507d95..703cc1c 100644
--- a/pkg/analyzer/analyzer.go
+++ b/pkg/analyzer/analyzer.go
@@ -125,7 +125,7 @@ const (
 )
 
 func (n *nilNil) isDangerNilType(t types.Type) (bool, zeroValue) {
-	switch v := t.(type) {
+	switch v := types.Unalias(t).(type) {
 	case *types.Pointer:
 		return n.checkedTypes.Contains(ptrType), zeroValueNil
 
diff --git a/pkg/analyzer/analyzer_test.go b/pkg/analyzer/analyzer_test.go
index 71475db..bd34943 100644
--- a/pkg/analyzer/analyzer_test.go
+++ b/pkg/analyzer/analyzer_test.go
@@ -1,3 +1,5 @@
+//go:debug gotypesalias=1
+
 package analyzer_test
 
 import (