diff --git a/Inventarios/RepMaximoMinimo.aspx.vb b/Inventarios/RepMaximoMinimo.aspx.vb
index a7041d10b..a9b3d4bed 100644
--- a/Inventarios/RepMaximoMinimo.aspx.vb
+++ b/Inventarios/RepMaximoMinimo.aspx.vb
@@ -241,7 +241,7 @@ Partial Class Inventarios_RepMaximoMinimo
         DdlAlmacenModal.Enabled = False
         DdlPSModal.Enabled = False
 
-        DdlAlmacenModal.SelectedValue = -1
+        DdlAlmacenModal.SelectedValue = "-1"
         DdlAlmacenModal.SelectedValueExist(CveAlmacen.ToString())
         DdlPSModal.SelectedText = strPS
         DdlPSModal.SelectedValue = CvePS.ToString