diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/timers/TimersPlugin.java b/runelite-client/src/main/java/net/runelite/client/plugins/timers/TimersPlugin.java
index dcf01d3daf..ad0173b5fe 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/timers/TimersPlugin.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/timers/TimersPlugin.java
@@ -119,8 +119,8 @@ public class TimersPlugin extends Plugin
 	private static final int VENOM_VALUE_CUTOFF = -40; // Antivenom < -40 <= Antipoison < 0
 	private static final int POISON_TICK_LENGTH = 30;
 
-	private static final int FIGHT_CAVES_REGION_ID = 9551;
-	private static final int INFERNO_REGION_ID = 9043;
+	static final int FIGHT_CAVES_REGION_ID = 9551;
+	static final int INFERNO_REGION_ID = 9043;
 	private static final Pattern TZHAAR_WAVE_MESSAGE = Pattern.compile("Wave: (\\d+)");
 	private static final String TZHAAR_DEFEATED_MESSAGE = "You have been defeated!";
 	private static final Pattern TZHAAR_COMPLETE_MESSAGE = Pattern.compile("Your (TzTok-Jad|TzKal-Zuk) kill count is:");
@@ -679,7 +679,16 @@ public class TimersPlugin extends Plugin
 				int wave = Integer.parseInt(matcher.group(1));
 				if (wave == 1)
 				{
-					config.tzhaarStartTime(now);
+					if (isInInferno())
+					{
+						// The first wave message of the inferno comes six seconds after the ingame timer starts counting
+						config.tzhaarStartTime(now.minus(Duration.ofSeconds(6)));
+					}
+					else
+					{
+						config.tzhaarStartTime(now);
+					}
+
 					createTzhaarTimer();
 				}
 			}
diff --git a/runelite-client/src/test/java/net/runelite/client/plugins/timers/TimersPluginTest.java b/runelite-client/src/test/java/net/runelite/client/plugins/timers/TimersPluginTest.java
index 494db7bd9d..20a1df10d1 100644
--- a/runelite-client/src/test/java/net/runelite/client/plugins/timers/TimersPluginTest.java
+++ b/runelite-client/src/test/java/net/runelite/client/plugins/timers/TimersPluginTest.java
@@ -63,8 +63,6 @@ import org.mockito.stubbing.Answer;
 @RunWith(MockitoJUnitRunner.class)
 public class TimersPluginTest
 {
-	private static final int FIGHT_CAVES_REGION_ID = 9551;
-
 	@Inject
 	private TimersPlugin timersPlugin;
 
@@ -270,7 +268,7 @@ public class TimersPluginTest
 	public void testTzhaarTimer()
 	{
 		when(timersConfig.showTzhaarTimers()).thenReturn(true);
-		when(client.getMapRegions()).thenReturn(new int[]{FIGHT_CAVES_REGION_ID});
+		when(client.getMapRegions()).thenReturn(new int[]{TimersPlugin.FIGHT_CAVES_REGION_ID});
 
 		class InstantRef
 		{
@@ -327,4 +325,34 @@ public class TimersPluginTest
 		verify(infoBoxManager, times(3)).removeInfoBox(captor.capture());
 		verify(infoBoxManager, times(3)).addInfoBox(captor.capture());
 	}
+
+	@Test
+	public void testInfernoTimerStartOffset()
+	{
+		when(timersConfig.showTzhaarTimers()).thenReturn(true);
+		when(client.getMapRegions()).thenReturn(new int[]{TimersPlugin.INFERNO_REGION_ID});
+
+		class InstantRef
+		{
+			Instant i;
+		}
+
+		InstantRef startTime = new InstantRef();
+		when(timersConfig.tzhaarStartTime()).then(a -> startTime.i);
+		doAnswer((Answer<Void>) invocationOnMock ->
+		{
+			Object argument = invocationOnMock.getArguments()[0];
+			startTime.i = (Instant) argument;
+			return null;
+		}).when(timersConfig).tzhaarStartTime(nullable(Instant.class));
+
+		ChatMessage chatMessage = new ChatMessage(null, ChatMessageType.GAMEMESSAGE, "", "<col=ef1020>Wave: 1</col>", "", 0);
+		timersPlugin.onChatMessage(chatMessage);
+
+		ArgumentCaptor<InfoBox> captor = ArgumentCaptor.forClass(InfoBox.class);
+		verify(infoBoxManager, times(1)).addInfoBox(captor.capture());
+		assertTrue(captor.getValue() instanceof ElapsedTimer);
+		ElapsedTimer timer = (ElapsedTimer) captor.getValue();
+		assertEquals("00:06", timer.getText());
+	}
 }
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