diff --git a/regression_test/map_param/PT.cc b/regression_test/map_param/PT.cc
index a38ec42c87dd225dee3690e89fead53b19372c29..0baf04065709e63cefb6456db45a0b830eab0f8a 100644
--- a/regression_test/map_param/PT.cc
+++ b/regression_test/map_param/PT.cc
@@ -9,7 +9,7 @@
 
 #include "PT.hh"
 
-namespace map_param_common {
+namespace map__param__common {
 
 PT::PT(const char *par_port_name)
 	: PT_BASE(par_port_name)
diff --git a/regression_test/map_param/PT.hh b/regression_test/map_param/PT.hh
index bbaa559c85c763e29d1d5738506a8f06c5fade99..336fdc4522d4354b1e4cb8fb3510c49bb572c5ea 100644
--- a/regression_test/map_param/PT.hh
+++ b/regression_test/map_param/PT.hh
@@ -12,7 +12,7 @@
 
 #include "map_param_common.hh"
 
-namespace map_param_common {
+namespace map__param__common {
 
 class PT : public PT_BASE {
 public: