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-rw-r--r--miasm2/core/asmbloc.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/miasm2/core/asmbloc.py b/miasm2/core/asmbloc.py
index a6d652be..7089e888 100644
--- a/miasm2/core/asmbloc.py
+++ b/miasm2/core/asmbloc.py
@@ -103,7 +103,8 @@ class asm_constraint_to(asm_constraint):
 
 class asm_bloc(object):
 
-    def __init__(self, label=None, alignment=1):
+    def __init__(self, label, alignment=1):
+        assert isinstance(label, asm_label)
         self.bto = set()
         self.lines = []
         self.label = label