diff --git a/src/TextField/EnhancedTextarea.js b/src/TextField/EnhancedTextarea.js
index 9ba4ee274cdbd3..e3a5bbafcabba9 100644
--- a/src/TextField/EnhancedTextarea.js
+++ b/src/TextField/EnhancedTextarea.js
@@ -135,8 +135,8 @@ class EnhancedTextarea extends Component {
 
     const {prepareStyles} = this.context.muiTheme;
     const styles = getStyles(this.props, this.context, this.state);
-    const rootStyles = Object.assign({}, styles.root, style);
-    const textareaStyles = Object.assign({}, styles.textarea, textareaStyle);
+    const rootStyles = Object.assign(styles.root, style);
+    const textareaStyles = Object.assign(styles.textarea, textareaStyle);
     const shadowStyles = Object.assign({}, textareaStyles, styles.shadow, shadowStyle);
 
     if (this.props.hasOwnProperty('valueLink')) {
diff --git a/src/TextField/TextField.js b/src/TextField/TextField.js
index 3b77a6a78cbfe6..3c144a17f91649 100644
--- a/src/TextField/TextField.js
+++ b/src/TextField/TextField.js
@@ -54,7 +54,6 @@ const getStyles = (props, context, state) => {
       padding: 0,
       position: 'relative',
       width: '100%',
-      height: '100%',
       border: 'none',
       outline: 'none',
       backgroundColor: 'rgba(0,0,0,0)',
@@ -62,7 +61,8 @@ const getStyles = (props, context, state) => {
       cursor: props.disabled ? 'not-allowed' : 'initial',
       font: 'inherit',
     },
-    textarea: {},
+    textarea: {
+    },
   };
 
   Object.assign(styles.error, props.errorStyle);
@@ -74,6 +74,9 @@ const getStyles = (props, context, state) => {
     font: 'inherit',
   });
 
+  // Do not assign a height to the textarea as he handles it on his own.
+  styles.input.height = '100%';
+
   if (state.hasValue) {
     styles.floatingLabel.color = fade(props.disabled ? disabledTextColor : floatingLabelColor, 0.5);
   }