diff --git a/search/filters/SearchFilter.php b/search/filters/SearchFilter.php
index 6af60ea73..e09e97dd1 100644
--- a/search/filters/SearchFilter.php
+++ b/search/filters/SearchFilter.php
@@ -229,7 +229,7 @@ abstract class SearchFilter extends Object {
 	 * @return DataQuery
 	 */
 	protected function applyMany(DataQuery $query) {
-		throw new InvalidArgumentException(get_class($this) . "can't be used to filter by a list of items.");
+		throw new InvalidArgumentException(get_class($this) . " can't be used to filter by a list of items.");
 	}
 
 	/**
@@ -265,7 +265,7 @@ abstract class SearchFilter extends Object {
 	 * @return DataQuery
 	 */
 	protected function excludeMany(DataQuery $query) {
-		throw new InvalidArgumentException(get_class($this) . "can't be used to filter by a list of items.");
+		throw new InvalidArgumentException(get_class($this) . " can't be used to filter by a list of items.");
 	}
 	
 	/**