diff --git a/computeFeatures.py b/computeFeatures.py
index ff691757d5428574eb727dbdae4cb504d36c37d6..9dedd1219c33c318d2d1a1acf664353e07e4fd13 100644
--- a/computeFeatures.py
+++ b/computeFeatures.py
@@ -523,7 +523,7 @@ def VenusTHEIA_XS_getExpressions(feat, cfg):
                 warnings.warn("No " + b + "available on Venus.")
 
     if 'NDVI' in feat:
-        if cfg['b11'].isdigit() and cfg['b07'].isdigit():
+        if cfg['b11'].isdigit() and cfg['b7'].isdigit():
             expr[feat.index('NDVI')] = '(im1b' + cfg['b11'] + ' - im1b' + cfg['b7'] + ') / (im1b' + cfg[
                 'b11'] + ' + im1b' + cfg['b7'] + ')'
         else: