diff --git a/lib/simple_form/inputs/numeric_input.rb b/lib/simple_form/inputs/numeric_input.rb
index 320793c9..0b6f3f0f 100644
--- a/lib/simple_form/inputs/numeric_input.rb
+++ b/lib/simple_form/inputs/numeric_input.rb
@@ -5,6 +5,7 @@ module SimpleForm
 
       def input
         add_size!
+        input_html_classes.unshift("numeric")
         if SimpleForm.html5
           input_html_options[:type] ||= "number"
           input_html_options[:step] ||= integer? ? 1 : "any"
@@ -13,10 +14,6 @@ module SimpleForm
         @builder.text_field(attribute_name, input_html_options)
       end
 
-      def input_html_classes
-        super.unshift("numeric")
-      end
-
       private
 
       # Rails adds the size attr by default, if the :size key does not exist.
@@ -27,11 +24,11 @@ module SimpleForm
       def infer_attributes_from_validations!
         return unless has_validators?
 
-        numeric_validator = find_numericality_validator or return
-        validator_options = numeric_validator.options
-
-        input_html_options[:min] ||= minimum_value(validator_options)
-        input_html_options[:max] ||= maximum_value(validator_options)
+        if numeric_validator = find_numericality_validator
+          validator_options = numeric_validator.options
+          input_html_options[:min] ||= minimum_value(validator_options)
+          input_html_options[:max] ||= maximum_value(validator_options)
+        end
       end
 
       def integer?
diff --git a/lib/simple_form/inputs/string_input.rb b/lib/simple_form/inputs/string_input.rb
index 1d1f9bf1..1e442e83 100644
--- a/lib/simple_form/inputs/string_input.rb
+++ b/lib/simple_form/inputs/string_input.rb
@@ -4,15 +4,15 @@ module SimpleForm
       enable :placeholder, :maxlength, :pattern
 
       def input
-        input_html_options[:type] ||= input_type if SimpleForm.html5 && !string?
+        unless string?
+          input_html_classes.unshift("string")
+          input_html_options[:type] ||= input_type if SimpleForm.html5
+        end
+
         add_size!
         @builder.text_field(attribute_name, input_html_options)
       end
 
-      def input_html_classes
-        string? ? super : super.unshift("string")
-      end
-
       private
 
       def string?