diff --git a/src/core/raster/qgscontrastenhancement.cpp b/src/core/raster/qgscontrastenhancement.cpp
index 8bcbb434911..697bf5017df 100644
--- a/src/core/raster/qgscontrastenhancement.cpp
+++ b/src/core/raster/qgscontrastenhancement.cpp
@@ -63,7 +63,7 @@ QgsContrastEnhancement::QgsContrastEnhancement( const QgsContrastEnhancement& ce
   mMaximumValue = ce.mMaximumValue;
   mRasterDataTypeRange = ce.mRasterDataTypeRange;
 
-  mLookupTableOffset = mMinimumValue * -1;
+  mLookupTableOffset = minimumValuePossible( mRasterDataType ) * -1;
 
   // setContrastEnhancementAlgorithm sets also QgsContrastEnhancementFunction
   setContrastEnhancementAlgorithm( ce.mContrastEnhancementAlgorithm, false );