diff --git a/www/conservancy/static/supporter/2016-supporter-appeal.html b/www/conservancy/static/supporter/2016-supporter-appeal.html
index b7f54c176261a2799d4d6f5d84d9a6187852597e..36b53e038cd1d94e3b1ef05e50e8d16196f8434b 100644
--- a/www/conservancy/static/supporter/2016-supporter-appeal.html
+++ b/www/conservancy/static/supporter/2016-supporter-appeal.html
@@ -69,7 +69,7 @@
             <input type="hidden" name="item_name" value="Conservancy Supporter, Annual" />
             <input id="no_shipping" type="hidden" name="no_shipping" value="0" />
   <label for="amount"><strong>Amount:</strong> $</label>
-  <input id="amount" type="text" name="amount" size="7" minimum="120" value="120" />
+  <input id="amount" type="number" name="amount" size="7" min="120" value="120" />
   <span id="error" class="form-error-show">$120 is a minimum for Conservancy
   Supporters.  <a href="/donate">Donate smaller amounts here</a>.</span><br/>
 
@@ -138,7 +138,7 @@
             <input type="hidden" name="srt" value="0" />
             <input type="hidden" name="item_name" value="Conservancy Supporter, Monthly" />
   <label for="amount"><strong>Monthly Amount:</strong> $</label>
-  <input id="amount" type="text" name="a3" size="5" minimum="10" value="10" />
+  <input id="amount" type="number" name="a3" size="5" min="10" value="10" />
   <span id="error" class="form-error-show">$10/month is a minimum for Conservancy
   Supporters.  <a href="/donate">Donate smaller amounts here</a>.</span><br/>
                       <label for="wantGift"><strong>Do you want to receive a t-shirt? </strong></label>
@@ -197,7 +197,7 @@
             <input type="hidden" name="item_name" value="Conservancy Supporter, Annual Renewal" />
             <input id="no_shipping" type="hidden" name="no_shipping" value="0" />
   <label for="amount"><strong>Amount:</strong> $</label>
-  <input id="amount" type="text" name="amount" size="7" minimum="120" value="120" />
+  <input id="amount" type="number" name="amount" size="7" min="120" value="120" />
   <span id="error" class="form-error-show">$120 is a minimum for Conservancy
   Supporters.  <a href="/donate">Donate smaller amounts here</a>.</span><br/>