diff --git a/eve_api/forms.py b/eve_api/forms.py
index c657653..f6d1539 100644
--- a/eve_api/forms.py
+++ b/eve_api/forms.py
@@ -26,6 +26,11 @@ class EveAPIForm(forms.Form):
         if not 'user_id' in self.cleaned_data or self.cleaned_data['user_id'] == '':
             raise forms.ValidationError("Please provide a valid User ID")
 
+        try:
+            int(self.cleaned_data['user_id'])
+        except ValueError:
+            raise forms.ValidationError("Please provide a valid user ID.")
+
         try:
             eaccount = EVEAccount.objects.get(api_user_id=self.cleaned_data['user_id'])
         except EVEAccount.DoesNotExist: