diff --git a/src/org/geometerplus/android/fbreader/libraryService/SQLiteBooksDatabase.java b/src/org/geometerplus/android/fbreader/libraryService/SQLiteBooksDatabase.java
index 9747bc299..5326e8715 100644
--- a/src/org/geometerplus/android/fbreader/libraryService/SQLiteBooksDatabase.java
+++ b/src/org/geometerplus/android/fbreader/libraryService/SQLiteBooksDatabase.java
@@ -32,6 +32,7 @@ import org.geometerplus.zlibrary.core.config.ZLConfig;
 import org.geometerplus.zlibrary.core.filesystem.ZLFile;
 import org.geometerplus.zlibrary.core.options.ZLStringOption;
 import org.geometerplus.zlibrary.core.options.ZLIntegerOption;
+import org.geometerplus.zlibrary.core.util.RationalNumber;
 import org.geometerplus.zlibrary.core.util.ZLColor;
 import org.geometerplus.zlibrary.text.view.ZLTextPosition;
 import org.geometerplus.zlibrary.text.view.ZLTextFixedPosition;
diff --git a/src/org/geometerplus/fbreader/book/BooksDatabase.java b/src/org/geometerplus/fbreader/book/BooksDatabase.java
index 3c682cb0c..c706479cd 100644
--- a/src/org/geometerplus/fbreader/book/BooksDatabase.java
+++ b/src/org/geometerplus/fbreader/book/BooksDatabase.java
@@ -22,6 +22,7 @@ package org.geometerplus.fbreader.book;
 import java.util.*;
 
 import org.geometerplus.zlibrary.core.filesystem.ZLFile;
+import org.geometerplus.zlibrary.core.util.RationalNumber;
 import org.geometerplus.zlibrary.core.util.ZLColor;
 
 import org.geometerplus.zlibrary.text.view.ZLTextPosition;
diff --git a/src/org/geometerplus/fbreader/book/RationalNumber.java b/src/org/geometerplus/fbreader/book/RationalNumber.java
deleted file mode 100644
index 1b8191932..000000000
--- a/src/org/geometerplus/fbreader/book/RationalNumber.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package org.geometerplus.fbreader.book;
-
-public class RationalNumber {
-	public final long Numerator;
-	public final long Denominator;
-	
-	public RationalNumber(long numerator, long denominator) {
-		Numerator = numerator;
-		Denominator = denominator;
-	}
-}
diff --git a/src/org/geometerplus/zlibrary/core/util/RationalNumber.java b/src/org/geometerplus/zlibrary/core/util/RationalNumber.java
new file mode 100644
index 000000000..c60a2b24b
--- /dev/null
+++ b/src/org/geometerplus/zlibrary/core/util/RationalNumber.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2007-2013 Geometer Plus <contact@geometerplus.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+package org.geometerplus.zlibrary.core.util;
+
+public class RationalNumber {
+	public final long Numerator;
+	public final long Denominator;
+	
+	public RationalNumber(long numerator, long denominator) {
+		Numerator = numerator;
+		Denominator = denominator;
+	}
+}