diff --git a/Cantera/cxx/include/numerics.h b/Cantera/cxx/include/numerics.h
index 79422ec7c..ea143c3dd 100755
--- a/Cantera/cxx/include/numerics.h
+++ b/Cantera/cxx/include/numerics.h
@@ -3,5 +3,6 @@
 
 #include "kernel/DenseMatrix.h"
 #include "kernel/BandMatrix.h"
+#include "kernel/SquareMatrix.h"
 
 #endif