diff --git a/python/src/trezorlib/_internal/emulator.py b/python/src/trezorlib/_internal/emulator.py
index acdf131f8a..8ec49a8690 100644
--- a/python/src/trezorlib/_internal/emulator.py
+++ b/python/src/trezorlib/_internal/emulator.py
@@ -138,8 +138,6 @@ class Emulator:
         LOG.info(f"Emulator ready after {time.monotonic() - start:.3f} seconds")
 
     def wait(self, timeout: Optional[float] = None) -> int:
-        global _RUNNING_PIDS
-
         assert self.process is not None, "Emulator not started"
         ret = self.process.wait(timeout=timeout)
         _RUNNING_PIDS.remove(self.process)
@@ -167,8 +165,6 @@ class Emulator:
         )
 
     def start(self) -> None:
-        global _RUNNING_PIDS
-
         if self.process:
             if self.process.poll() is not None:
                 # process has died, stop and start again
@@ -198,8 +194,6 @@ class Emulator:
         self._client.open()
 
     def stop(self) -> None:
-        global _RUNNING_PIDS
-
         if self._client:
             self._client.close()
         self._client = None