diff --git a/templates/prescription/general_edit.html b/templates/prescription/general_edit.html
index 807e0353503..91ab7456d91 100644
--- a/templates/prescription/general_edit.html
+++ b/templates/prescription/general_edit.html
@@ -249,7 +249,7 @@
                         # {xlt t='of tablets'}:
                 </div>
                 <div class="col">
-                    <input class="input-sm form-control" type="text" id="per_refill" name="per_refill" size="2" maxlength="10" value="{$prescription->per_refill|attr}" />
+                    <input class="input-sm form-control" type="text" id="per_refill" name="per_refill" size="2" maxlength="9" value="{$prescription->per_refill|attr}" />
                 </div>
             {/if}
         </div>