diff --git a/include/cantera/numerics/BandMatrix.h b/include/cantera/numerics/BandMatrix.h
index 012061f85..9e8fda676 100644
--- a/include/cantera/numerics/BandMatrix.h
+++ b/include/cantera/numerics/BandMatrix.h
@@ -279,7 +279,7 @@ protected:
     //! value of zero
     doublereal m_zero;
 
-    class PivData; // pImpl wrapper class
+    struct PivData; // pImpl wrapper class
 
     //! Pivot vector
     std::unique_ptr<PivData> m_ipiv;