diff --git a/src/types.h b/src/types.h
index 0586813..6072d54 100755
--- a/src/types.h
+++ b/src/types.h
@@ -675,6 +675,7 @@ typedef struct {
     *XLNZ,       // Start position of each column in NZSUB
     *NZSUB,      // Row index of each coeff. in each column
     *LNZ,        // Position of each coeff. in Aij array
+    *Degree,     // Number of links adjacent to each node
     *link,       // Array used by linear eqn. solver
     *first;      // Array used by linear eqn. solver