diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
index 66a685eee223..91376ba230d5 100644
--- a/lib/matplotlib/backends/backend_qt5.py
+++ b/lib/matplotlib/backends/backend_qt5.py
@@ -1092,11 +1092,12 @@ def trigger_manager_draw(manager):
def mainloop():
old_signal = signal.getsignal(signal.SIGINT)
# allow SIGINT exceptions to close the plot window.
- if old_signal:
+ is_python_signal_handler = old_signal is not None
+ if is_python_signal_handler:
signal.signal(signal.SIGINT, signal.SIG_DFL)
try:
qApp.exec_()
finally:
# reset the SIGINT exception handler
- if old_signal:
+ if is_python_signal_handler:
signal.signal(signal.SIGINT, old_signal)
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