diff --git a/wp-content/themes/twentyten/loop.php b/wp-content/themes/twentyten/loop.php
index 811abfe039..9dc6297dfa 100644
--- a/wp-content/themes/twentyten/loop.php
+++ b/wp-content/themes/twentyten/loop.php
@@ -57,7 +57,7 @@
 
 <?php /* How to display posts of the Gallery format. The gallery category is the old way. */ ?>
 
-	<?php if ( 'gallery' == get_post_format( $post->ID ) || in_category( _x( 'gallery', 'gallery category slug', 'twentyten' ) ) ) : ?>
+	<?php if ( ( function_exists( 'get_post_format' ) && 'gallery' == get_post_format( $post->ID ) ) || in_category( _x( 'gallery', 'gallery category slug', 'twentyten' ) ) ) : ?>
 		<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
 			<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
 
@@ -89,7 +89,7 @@
 			</div><!-- .entry-content -->
 
 			<div class="entry-utility">
-			<?php if ( 'gallery' == get_post_format( $post->ID ) ) : ?>
+			<?php if ( function_exists( 'get_post_format' ) && 'gallery' == get_post_format( $post->ID ) ) : ?>
 				<a href="<?php echo get_post_format_link( 'gallery' ); ?>" title="<?php esc_attr_e( 'View Galleries', 'twentyten' ); ?>"><?php _e( 'More Galleries', 'twentyten' ); ?></a>
 				<span class="meta-sep">|</span>
 			<?php elseif ( in_category( _x( 'gallery', 'gallery category slug', 'twentyten' ) ) ) : ?>
@@ -103,7 +103,7 @@
 
 <?php /* How to display posts of the Aside format. The asides category is the old way. */ ?>
 
-	<?php elseif ( 'aside' == get_post_format( $post->ID ) || in_category( _x( 'asides', 'asides category slug', 'twentyten' ) )  ) : ?>
+	<?php elseif ( ( function_exists( 'get_post_format' ) && 'aside' == get_post_format( $post->ID ) ) || in_category( _x( 'asides', 'asides category slug', 'twentyten' ) )  ) : ?>
 		<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
 
 		<?php if ( is_archive() || is_search() ) : // Display excerpts for archives and search. ?>