diff --git a/silly-metrics/src/main/java/silly/metrics/KeywordCounter.java b/silly-metrics/src/main/java/silly/metrics/KeywordCounter.java
index 0b8d6a3..08da080 100644
--- a/silly-metrics/src/main/java/silly/metrics/KeywordCounter.java
+++ b/silly-metrics/src/main/java/silly/metrics/KeywordCounter.java
@@ -222,6 +222,7 @@ else if (file.getName().endsWith(".java")) {
             RandomAccessFile f = new RandomAccessFile(file, "r");
             byte[] contents = new byte[(int) f.length()];
             f.readFully(contents);
+            f.close();
             String content = new String(contents);
 
             char c;