diff --git a/ex21.out b/ex21.out
index 7333a325d..339f19afc 100644
--- a/ex21.out
+++ b/ex21.out
@@ -436,7 +436,7 @@ WARNING: USER_PUNCH: Headings count does not match number of calls to PUNCH.
 
                                        pH  =   7.600    
                                        pe  =  13.120      Equilibrium with O2(g)
-      Specific Conductance (µS/cm,  23°C)  = 29069
+      Specific Conductance (µS/cm,  23°C)  = 29068
                           Density (g/cm³)  =   1.01168
                                Volume (L)  =   0.20147
                         Viscosity (mPa s)  =   0.96935