diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index fd6969cd3d..5069a491e8 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -1721,9 +1721,11 @@ class DecimalField(Field):
             )
         return decimal_value
 
-    def get_db_prep_save(self, value, connection):
+    def get_db_prep_value(self, value, connection, prepared=False):
+        if not prepared:
+            value = self.get_prep_value(value)
         return connection.ops.adapt_decimalfield_value(
-            self.to_python(value), self.max_digits, self.decimal_places
+            value, self.max_digits, self.decimal_places
         )
 
     def get_prep_value(self, value):