Index: Classes/Persistence/Storage/Typo3DbBackend.php
===================================================================
--- Classes/Persistence/Storage/Typo3DbBackend.php	(revision 10137)
+++ Classes/Persistence/Storage/Typo3DbBackend.php	(working copy)
@@ -747,11 +747,11 @@
 				} elseif (is_array($parameter) || ($parameter instanceof ArrayAccess) || ($parameter instanceof Traversable)) {
 					$items = array();
 					foreach ($parameter as $item) {
-						$items[] = $this->databaseHandle->fullQuoteStr($item, 'foo');
+						$items[] = $this->correctEscape($item);
 					}
 					$parameter = '(' . implode(',', $items) . ')';
 				} else {
-					$parameter = $this->databaseHandle->fullQuoteStr($parameter, 'foo'); // FIXME This may not work with DBAL; check this
+					$parameter = $this->correctEscape($parameter);
 				}
 				$sqlString = substr($sqlString, 0, $markPosition) . $parameter . substr($sqlString, $markPosition + 1);
 			}
@@ -759,6 +759,16 @@
 		}
 	}
 
+	protected function correctEscape($value) {
+		if (is_int($value)) {
+			return $value;
+		} elseif((int)$value == $value) {
+			return (int)$value;
+		} else {
+			return $this->databaseHandle->fullQuoteStr($item, 'foo'); // FIXME This may not work with DBAL; check this
+		}
+	}
+
 	/**
 	 * Adds additional WHERE statements according to the query settings.
 	 *