diff --git a/src/main/java/lib/PatPeter/SQLibrary/FilenameDatabase.java b/src/main/java/lib/PatPeter/SQLibrary/FilenameDatabase.java
index a6041f4..d33615e 100644
--- a/src/main/java/lib/PatPeter/SQLibrary/FilenameDatabase.java
+++ b/src/main/java/lib/PatPeter/SQLibrary/FilenameDatabase.java
@@ -75,6 +75,7 @@ public void setExtension(String extension) {
 			throw new DatabaseException("Extension cannot be null or empty.");
 		if (extension.charAt(0) != '.')
 			throw new DatabaseException("Extension must begin with a period");
+		this.extension = extension;
 	}
 	
 	public File getFile() {