diff --git a/sympde/topology/mapping.py b/sympde/topology/mapping.py
index 4e6af3b2..b7901859 100644
--- a/sympde/topology/mapping.py
+++ b/sympde/topology/mapping.py
@@ -384,6 +384,13 @@ def _sympystr(self, printer):
         mapping = sstr(self.mapping)
         return 'inv_det({})'.format(mapping)
 
+class SymbolicWeightedVolume(SymbolicMappingExpr):
+    _name = 'wvol'
+    def _sympystr(self, printer):
+        sstr = printer.doprint
+        mapping = sstr(self.mapping)
+        return 'wvol({})'.format(mapping)
+
 #==============================================================================
 class MappingApplication(Function):
     nargs = None