diff --git a/python/plugins/processing/algs/qgis/Buffer.py b/python/plugins/processing/algs/qgis/Buffer.py
index 00fdb2ba5bb..d84ee0e65ba 100644
--- a/python/plugins/processing/algs/qgis/Buffer.py
+++ b/python/plugins/processing/algs/qgis/Buffer.py
@@ -58,7 +58,7 @@ def buffering(progress, writer, distance, field, useField, layer, dissolve,
 
             inGeom = QgsGeometry(inFeat.geometry())
             if inGeom.isGeosEmpty() or not inGeom.isGeosValid():
-                ProcessingLog.addToLog('Feature {} has empty or invalid geometry. Skipping...'.format(inFeat.id()), ProcessingLog.LOG_WARNING)
+                ProcessingLog.addToLog(ProcessingLog.LOG_WARNING, 'Feature {} has empty or invalid geometry. Skipping...'.format(inFeat.id()))
                 continue
             outGeom = inGeom.buffer(float(value), segments)
             if first:
@@ -83,7 +83,7 @@ def buffering(progress, writer, distance, field, useField, layer, dissolve,
                 value = distance
             inGeom = QgsGeometry(inFeat.geometry())
             if inGeom.isGeosEmpty() or not inGeom.isGeosValid():
-                ProcessingLog.addToLog('Feature {} has empty or invalid geometry. Skipping...'.format(inFeat.id()), ProcessingLog.LOG_WARNING)
+                ProcessingLog.addToLog( ProcessingLog.LOG_WARNING, 'Feature {} has empty or invalid geometry. Skipping...'.format(inFeat.id()))
                 continue
 
             outGeom = inGeom.buffer(float(value), segments)