diff --git a/alternatingcaps.py b/alternatingcaps.py
index 9f9eae6..fce4b86 100644
--- a/alternatingcaps.py
+++ b/alternatingcaps.py
@@ -4,13 +4,13 @@
 
 
 class AlternatingCaps(Plugin):
-    last_message = None
+    last_messages = {}
 
     @event.on(EventType.ROOM_MESSAGE)
     async def message_handler(self, evt: MessageEvent) -> None:
-        self.last_message = evt.content.body
+        self.last_messages[evt.room_id] = evt.content.body
 
     @command.new()
     async def altcaps(self, evt: MessageEvent) -> None:
-        if self.last_message:
-            await evt.respond("".join([c.upper() if i % 2 else c.lower() for i, c in enumerate(self.last_message)]))
+        if evt.room_id in self.last_messages:
+            await evt.respond("".join([c.upper() if i % 2 else c.lower() for i, c in enumerate(self.last_messages[evt.room_id])]))
diff --git a/maubot.yaml b/maubot.yaml
index 892434a..965d64e 100644
--- a/maubot.yaml
+++ b/maubot.yaml
@@ -2,7 +2,7 @@
 id: pl.rom4nik.maubot.alternatingcaps
 
 # A PEP 440 compliant version string.
-version: 0.1.0
+version: 0.1.1
 
 # The SPDX license identifier for the plugin. https://spdx.org/licenses/
 # Optional, assumes all rights reserved if omitted.