diff --git a/src/main/java/uk/betacraft/jaranalyzer/JarAnalyzer.java b/src/main/java/uk/betacraft/jaranalyzer/JarAnalyzer.java
index 3356d4e..8c94955 100644
--- a/src/main/java/uk/betacraft/jaranalyzer/JarAnalyzer.java
+++ b/src/main/java/uk/betacraft/jaranalyzer/JarAnalyzer.java
@@ -15,7 +15,7 @@
 
 public class JarAnalyzer {
     // assuming UTC by default
-    private static final String tzID = System.getProperty("timezone", "UTC");
+    private static final String tzID = System.getProperty("tz", "UTC");
     private static TimeZone tz = TimeZone.getTimeZone(tzID);
 
     public static void main(String[] args) {