diff --git a/agrolib/interpolation/interpolation.cpp b/agrolib/interpolation/interpolation.cpp
index bbed1f73..1ed4a955 100644
--- a/agrolib/interpolation/interpolation.cpp
+++ b/agrolib/interpolation/interpolation.cpp
@@ -1769,7 +1769,7 @@ bool multipleDetrendingMain(std::vector <Crit3DInterpolationDataPoint> &myPoints
         if (!multipleDetrendingElevationFitting(elevationPos, myPoints, mySettings, myVar, errorStr, true))
             return false;
 
-        detrendingElevation(elevationPos, myPoints, mySettings);
+        if (mySettings->getCurrentCombination().isProxySignificant(elevationPos)) detrendingElevation(elevationPos, myPoints, mySettings);
     }
 
     if (!multipleDetrendingOtherProxiesFitting(elevationPos, myPoints, mySettings, myVar, errorStr))
@@ -2159,7 +2159,7 @@ bool glocalDetrendingFitting(std::vector <Crit3DInterpolationDataPoint> &myPoint
             if (elevationPos != NODATA && mySettings->getSelectedCombination().isProxyActive(elevationPos))
             {
                 if (!multipleDetrendingElevationFitting(elevationPos, subsetPoints, mySettings, myVar, errorStr, false)) return false;
-                detrendingElevation(elevationPos, subsetPoints, mySettings);
+                if (mySettings->getCurrentCombination().isProxySignificant(elevationPos)) detrendingElevation(elevationPos, subsetPoints, mySettings);
             }
             if (!multipleDetrendingOtherProxiesFitting(elevationPos, subsetPoints, mySettings, myVar, errorStr))
                 return false;
diff --git a/agrolib/project/project.cpp b/agrolib/project/project.cpp
index 784804ad..fdbb823f 100644
--- a/agrolib/project/project.cpp
+++ b/agrolib/project/project.cpp
@@ -3488,7 +3488,7 @@ void Project::macroAreaDetrending(Crit3DMacroArea myArea, meteoVariable myVar, s
     }
 
     //detrending
-    if (elevationPos != NODATA && myArea.getCombination().isProxyActive(elevationPos))
+    if (elevationPos != NODATA && myArea.getCombination().isProxyActive(elevationPos) && myArea.getCombination().isProxySignificant(elevationPos))
     {
         detrendingElevation(elevationPos, subsetInterpolationPoints, &interpolationSettings);
     }