diff --git a/src/wp-includes/js/media-editor.js b/src/wp-includes/js/media-editor.js
index e972f6b39c..3852543aa4 100644
--- a/src/wp-includes/js/media-editor.js
+++ b/src/wp-includes/js/media-editor.js
@@ -48,28 +48,9 @@
 		 * @returns {Object} Joined props
 		 */
 		props: function( props, attachment ) {
-			var link, linkUrl, size, sizes, fallbacks,
+			var link, linkUrl, size, sizes,
 				defaultProps = wp.media.view.settings.defaultProps;
 
-			// Final fallbacks run after all processing has been completed.
-			fallbacks = function( props ) {
-				// Generate alt fallbacks and strip tags.
-				if ( 'image' === props.type && ! props.alt ) {
-					if ( props.caption ) {
-						props.alt = props.caption;
-					} else if ( props.title !== props.url ) {
-						props.alt = props.title;
-					} else {
-						props.alt = '';
-					}
-
-					props.alt = props.alt.replace( /<\/?[^>]+>/g, '' );
-					props.alt = props.alt.replace( /[\r\n]+/g, ' ' );
-				}
-
-				return props;
-			};
-
 			props = props ? _.clone( props ) : {};
 
 			if ( attachment && attachment.type ) {
@@ -87,7 +68,7 @@
 
 			// All attachment-specific settings follow.
 			if ( ! attachment ) {
-				return fallbacks( props );
+				return props;
 			}
 
 			props.title = props.title || attachment.title;
@@ -123,7 +104,7 @@
 				props.rel = props.rel || 'attachment wp-att-' + attachment.id;
 			}
 
-			return fallbacks( props );
+			return props;
 		},
 		/**
 		 * Create link markup that is suitable for passing to the editor
diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index 7a316d1ecf..f6c5f0f294 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -866,12 +866,8 @@ function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = fa
 		$default_attr = array(
 			'src'	=> $src,
 			'class'	=> "attachment-$size_class size-$size_class",
-			'alt'	=> trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first
+			'alt'	=> trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
 		);
-		if ( empty($default_attr['alt']) )
-			$default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption
-		if ( empty($default_attr['alt']) )
-			$default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title
 
 		$attr = wp_parse_args( $attr, $default_attr );
 
diff --git a/tests/phpunit/tests/media.php b/tests/phpunit/tests/media.php
index b4787e6342..7209f5e69e 100644
--- a/tests/phpunit/tests/media.php
+++ b/tests/phpunit/tests/media.php
@@ -915,6 +915,34 @@ EOF;
 		remove_filter( 'embed_maybe_make_link', array( $this, 'filter_wp_embed_shortcode_custom' ), 10 );
 	}
 
+	/**
+	 * Tests the default output of `wp_get_attachment_image()`.
+	 * @ticket 34635
+	 */
+	function test_wp_get_attachment_image_defaults() {
+		$image = image_downsize( self::$large_id, 'thumbnail' );
+		$expected = sprintf( '<img width="%1$d" height="%2$d" src="%3$s" class="attachment-thumbnail size-thumbnail" alt="" />', $image[1], $image[2], $image[0] );
+
+		$this->assertEquals( $expected, wp_get_attachment_image( self::$large_id ) );
+	}
+
+	/**
+	 * Test that `wp_get_attachment_image()` returns a proper alt value.
+	 * @ticket 34635
+	 */
+	function test_wp_get_attachment_image_with_alt() {
+		// Add test alt metadata.
+		update_post_meta( self::$large_id, '_wp_attachment_image_alt', 'Some very clever alt text', true );
+
+		$image = image_downsize( self::$large_id, 'thumbnail' );
+		$expected = sprintf( '<img width="%1$d" height="%2$d" src="%3$s" class="attachment-thumbnail size-thumbnail" alt="Some very clever alt text" />', $image[1], $image[2], $image[0] );
+
+		$this->assertEquals( $expected, wp_get_attachment_image( self::$large_id ) );
+
+		// Cleanup.
+		update_post_meta( self::$large_id, '_wp_attachment_image_alt', '', true );
+	}
+
 	/**
 	 * @ticket 33878
 	 */
@@ -1808,7 +1836,7 @@ EOF;
 		$month = date( 'm' );
 
 		$expected = '<img width="999" height="999" src="http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/' . $year . '/' . $month . '/test-image-testsize-999x999.png"' .
-			' class="attachment-testsize size-testsize" alt="test-image-large.png"' .
+			' class="attachment-testsize size-testsize" alt=""' .
 			' srcset="http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/' . $year . '/' . $month . '/test-image-testsize-999x999.png 999w,' .
 				' http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/' . $year . '/' . $month . '/test-image-large-150x150.png 150w"' .
 				' sizes="(max-width: 999px) 100vw, 999px" />';