diff --git a/src/epanet.c b/src/epanet.c
index 04d74af..f2e33e4 100644
--- a/src/epanet.c
+++ b/src/epanet.c
@@ -3862,7 +3862,7 @@ int DLLEXPORT EN_setlinkvalue(EN_Project p, int index, int property, double valu
     case EN_MINORLOSS:
         if (Link[index].Type != PUMP)
         {
-            if (value <= 0.0) return 211;
+            if (value < 0.0) return 211;
             Link[index].Km = 0.02517 * value / SQR(Link[index].Diam) /
                              SQR(Link[index].Diam);
         }