diff --git a/python/plugins/processing/script/ScriptAlgorithm.py b/python/plugins/processing/script/ScriptAlgorithm.py
index 40b253403a2..63120061d9d 100644
--- a/python/plugins/processing/script/ScriptAlgorithm.py
+++ b/python/plugins/processing/script/ScriptAlgorithm.py
@@ -213,7 +213,10 @@ class ScriptAlgorithm(QgsProcessingAlgorithm):
             elif param.type() == "vector":
                 method = self.parameterAsVectorLayer
             elif param.type() == "field":
-                method = self.parameterAsString
+                if param.allowMultiple():
+                    method = self.parameterAsFields
+                else:
+                    method = self.parameterAsString
             elif param.type() == "source":
                 method = self.parameterAsSource