diff --git a/src/ng/directive/input.js b/src/ng/directive/input.js
index 3586815ec541..767c855683ff 100644
--- a/src/ng/directive/input.js
+++ b/src/ng/directive/input.js
@@ -1228,7 +1228,7 @@ function numberInputType(scope, element, attr, ctrl, $sniffer, $browser) {
     return value;
   });
 
-  if (attr.min || attr.ngMin) {
+  if (isDefined(attr.min) || attr.ngMin) {
     var minVal;
     ctrl.$validators.min = function(value) {
       return ctrl.$isEmpty(value) || isUndefined(minVal) || value >= minVal;
@@ -1244,7 +1244,7 @@ function numberInputType(scope, element, attr, ctrl, $sniffer, $browser) {
     });
   }
 
-  if (attr.max || attr.ngMax) {
+  if (isDefined(attr.max) || attr.ngMax) {
     var maxVal;
     ctrl.$validators.max = function(value) {
       return ctrl.$isEmpty(value) || isUndefined(maxVal) || value <= maxVal;