diff --git a/django/contrib/gis/db/backends/oracle/operations.py b/django/contrib/gis/db/backends/oracle/operations.py
index 2a166f23a1..a6a0f464c9 100644
--- a/django/contrib/gis/db/backends/oracle/operations.py
+++ b/django/contrib/gis/db/backends/oracle/operations.py
@@ -78,6 +78,8 @@ class OracleOperations(BaseSpatialOperations, DatabaseOperations):
     union = 'SDO_GEOM.SDO_UNION'
     unionagg = 'SDO_AGGR_UNION'
 
+    from_text = 'SDO_GEOMETRY'
+
     function_names = {
         'Area': 'SDO_GEOM.SDO_AREA',
         'Centroid': 'SDO_GEOM.SDO_CENTROID',
diff --git a/django/contrib/gis/db/models/functions.py b/django/contrib/gis/db/models/functions.py
index 7355bbcbfc..b98a2e134b 100644
--- a/django/contrib/gis/db/models/functions.py
+++ b/django/contrib/gis/db/models/functions.py
@@ -72,21 +72,15 @@ class GeomValue(Value):
         return self.value.srid
 
     def as_sql(self, compiler, connection):
+        return '%s(%%s, %s)' % (connection.ops.from_text, self.srid), [connection.ops.Adapter(self.value)]
+
+    def as_postgresql(self, compiler, connection):
         if self.geography:
             self.value = connection.ops.Adapter(self.value, geography=self.geography)
         else:
             self.value = connection.ops.Adapter(self.value)
         return super(GeomValue, self).as_sql(compiler, connection)
 
-    def as_mysql(self, compiler, connection):
-        return 'GeomFromText(%%s, %s)' % self.srid, [connection.ops.Adapter(self.value)]
-
-    def as_sqlite(self, compiler, connection):
-        return 'GeomFromText(%%s, %s)' % self.srid, [connection.ops.Adapter(self.value)]
-
-    def as_oracle(self, compiler, connection):
-        return 'SDO_GEOMETRY(%%s, %s)' % self.srid, [connection.ops.Adapter(self.value)]
-
 
 class GeoFuncWithGeoParam(GeoFunc):
     def __init__(self, expression, geom, *expressions, **extra):