diff --git a/orangecontrib/spectroscopy/preprocess/integrate.py b/orangecontrib/spectroscopy/preprocess/integrate.py
index 75af3ee2e..59f0b09bd 100644
--- a/orangecontrib/spectroscopy/preprocess/integrate.py
+++ b/orangecontrib/spectroscopy/preprocess/integrate.py
@@ -90,10 +90,10 @@ def compute_baseline(self, x, y):
         return edge_baseline(x, y)
 
     def compute_integral(self, x, y_s):
-        y_s = y_s - self.compute_baseline(x, y_s)
         if np.any(np.isnan(y_s)):
             # interpolate unknowns as trapz can not handle them
             y_s, _ = nan_extend_edges_and_interpolate(x, y_s)
+        y_s = y_s - self.compute_baseline(x, y_s)
         return np.trapz(y_s, x, axis=1)
 
     def compute_draw_info(self, x, ys):