diff --git a/include/openbabel/distgeom.h b/include/openbabel/distgeom.h
index 31fc87d..b3af7ba 100644
--- a/include/openbabel/distgeom.h
+++ b/include/openbabel/distgeom.h
@@ -29,7 +29,7 @@ GNU General Public License for more details.
 
 #ifdef HAVE_EIGEN
 
-#include <Eigen/Dense>
+#include <Eigen/Core>
 
 namespace OpenBabel {