diff --git a/Earthfile b/Earthfile
index 80d5e00..7f9d00a 100644
--- a/Earthfile
+++ b/Earthfile
@@ -226,7 +226,7 @@ docker:
     IF [ "$K3S_VERSION" = "" ]
         ARG OS_VERSION=c3OS${C3OS_VERSION}
     ELSE
-        ARG OS_VERSION=${K3S_VERSION}+k3s1-c3OS${C3OS_VERSION}
+        ARG OS_VERSION=${K3S_VERSION}-c3OS${C3OS_VERSION}
     END
 
     ARG OS_ID