diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index b1da6f109f..65ab7ba0d7 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -4262,11 +4262,20 @@ function is_object_in_term( $object_id, $taxonomy, $terms = null ) {
 		$strs =& $terms;
 
 	foreach ( $object_terms as $object_term ) {
-		if ( $ints && in_array( $object_term->term_id, $ints ) ) return true; // If int, check against term_id
+		// If term is an int, check against term_ids only.
+		if ( $ints && in_array( $object_term->term_id, $ints ) ) {
+			return true;
+		}
+
 		if ( $strs ) {
-			if ( in_array( $object_term->term_id, $strs ) ) return true;
-			if ( in_array( $object_term->name, $strs ) )    return true;
-			if ( in_array( $object_term->slug, $strs ) )    return true;
+			// Only check numeric strings against term_id, to avoid false matches due to type juggling.
+			$numeric_strs = array_map( 'intval', array_filter( $strs, 'is_numeric' ) );
+			if ( in_array( $object_term->term_id, $numeric_strs, true ) ) {
+				return true;
+			}
+
+			if ( in_array( $object_term->name, $strs ) ) return true;
+			if ( in_array( $object_term->slug, $strs ) ) return true;
 		}
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 2881baa92c..04c268b828 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-alpha-30204';
+$wp_version = '4.1-alpha-30205';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.