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-rw-r--r--test/sparse.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/sparse.h b/test/sparse.h
index 4733e4d10..246dc1f14 100644
--- a/test/sparse.h
+++ b/test/sparse.h
@@ -41,6 +41,7 @@ namespace std {
#include <Eigen/Cholesky>
#include <Eigen/LU>
#include <Eigen/Sparse>
+#include <Eigen/SparseExtra>
enum {
ForceNonZeroDiag = 1,