diff --git a/ipc/ipdl/ipdl/cxx/cgen.py b/ipc/ipdl/ipdl/cxx/cgen.py
index b07df7b9401..48b098876e6 100644
--- a/ipc/ipdl/ipdl/cxx/cgen.py
+++ b/ipc/ipdl/ipdl/cxx/cgen.py
@@ -217,6 +217,9 @@ class CxxCodeGen(CodePrinter, Visitor):
 
 
     def visitMethodDefn(self, md):
+        if md.decl.pure:
+            return
+
         self.printdent()
         md.decl.accept(self)
         self.println()
diff --git a/ipc/ipdl/ipdl/lower.py b/ipc/ipdl/ipdl/lower.py
index b3d5109b49e..0c8a85fbdba 100644
--- a/ipc/ipdl/ipdl/lower.py
+++ b/ipc/ipdl/ipdl/lower.py
@@ -5460,7 +5460,6 @@ def _splitMethodDefn(md, clsname):
     md.decl.static = 0
     md.decl.warn_unused = 0
     md.decl.never_inline = 0
-    md.decl.pure = 0
     md.decl.only_for_definition = True
     for param in md.decl.params:
         if isinstance(param, Param):