diff --git a/htsinfer/models.py b/htsinfer/models.py
index f8ab629..872e413 100644
--- a/htsinfer/models.py
+++ b/htsinfer/models.py
@@ -50,7 +50,8 @@ class RunStates(IntEnum):
         (
             'Casava >=1.8',
             re.compile(
-                r'(?P<prefix>\w+:\d+:\w+:\d+:\d+:\d+:\d+(:[ACGTN]\+[ACGTN])?)'
+                r'(?P<prefix>\w+:\d+:[\w-]+:\d+:\d+:\d+:\d+'
+                r'(:[ACGTN]\+[ACGTN])?)'
                 r'('
                 r'(?P<linker> )'
                 r'(?P<mate>[12])'