diff --git a/src/qibolab/_core/instruments/qblox/__init__.py b/src/qibolab/_core/instruments/qblox/__init__.py
index fdbca7fcc..e69de29bb 100644
--- a/src/qibolab/_core/instruments/qblox/__init__.py
+++ b/src/qibolab/_core/instruments/qblox/__init__.py
@@ -1 +0,0 @@
-from . import ast_
diff --git a/src/qibolab/_core/instruments/qblox/ast_.py b/src/qibolab/_core/instruments/qblox/ast_.py
index 4b3016c04..2df0a2aa2 100644
--- a/src/qibolab/_core/instruments/qblox/ast_.py
+++ b/src/qibolab/_core/instruments/qblox/ast_.py
@@ -68,7 +68,7 @@ def asm(self, key_width: Optional[int] = None) -> str:
         key = self.keyword()
         if key_width is None:
             key_width = len(key)
-        instr = f"{key:<{key_width+1}}"
+        instr = f"{key:<{key_width + 1}}"
         return (instr + ",".join([str(a) for a in self.args])).strip()
 
 
@@ -680,7 +680,7 @@ def asm(
             instr_name_width = len(self.instruction.keyword())
         if instr_width is None:
             instr_width = len(self.instruction.asm(instr_name_width))
-        code = f"{label:<{label_width+2}}{self.instruction.asm(instr_name_width):<{instr_width+1}}"
+        code = f"{label:<{label_width + 2}}{self.instruction.asm(instr_name_width):<{instr_width + 1}}"
         if self.comment is None:
             return code
         comment = _format_comment(