--- newmat6.cpp
+++ newmat6.cpp
@@ -424,7 +424,7 @@
 {
    if (&gm == this) { REPORT tag_val = -1; return; }
    REPORT
-   if (indx > 0) { delete [] indx; indx = 0; }
+   if (indx != 0) { delete [] indx; indx = 0; }
    ((CroutMatrix&)gm).get_aux(*this);
    Eq(gm);
 }