diff --git a/process b/process
index 3df49a8..e9f9fc6 100755
--- a/process
+++ b/process
@@ -90,7 +90,8 @@ def process_recording(filename):
 
             print(f'{block_date}: {max_amplitude:.1f}rDB @ {max_freq:.1f}Hz (noise {noise:.3f}rDB)')
         else:
-            is_detecting = False
+            if is_detecting:
+                is_detecting = False
 
 
 def main():