diff --git a/include/ui/TMatHelpers.h b/include/ui/TMatHelpers.h
index cead10a..a6aadca 100644
--- a/include/ui/TMatHelpers.h
+++ b/include/ui/TMatHelpers.h
@@ -245,7 +245,7 @@
 class TMatDebug {
 public:
     String8 asString() const {
-        return matrix::asString(*this);
+        return matrix::asString( static_cast< const BASE<T>& >(*this) );
     }
 };