diff --git a/pk3DS/Subforms/Gen7/SMWE.cs b/pk3DS/Subforms/Gen7/SMWE.cs
index 92ef969..8e89a7e 100644
--- a/pk3DS/Subforms/Gen7/SMWE.cs
+++ b/pk3DS/Subforms/Gen7/SMWE.cs
@@ -328,9 +328,9 @@ private void B_Save_Click(object sender, EventArgs e)
             int tot = 0;
             foreach (var nup in rate_spec) { tot += (int) nup.Value; }
             
-            if (tot != 100)
+            if (tot != 100 && tot != 0)
             {
-                WinFormsUtil.Error("Encounter rates must add up to 100%.");
+                WinFormsUtil.Error("Encounter rates must add up to either 0% or 100%.");
                 return;
             }