diff --git a/src/lasp/lasp_measurement.py b/src/lasp/lasp_measurement.py
index 64f1109..1b1607c 100644
--- a/src/lasp/lasp_measurement.py
+++ b/src/lasp/lasp_measurement.py
@@ -654,7 +654,7 @@ class Measurement:
         if normalize:
             # Scale back to maximum of absolute value
             maxabs = np.max(np.abs(data))
-            data /= maxabs
+            data = data / maxabs  # "data /= maxabs" fails if dtpyes differ
 
         if newsampwidth is not None:
             # Convert to floats, then to new sample width