diff --git a/configs/sim/cxxtest/Make.defs b/configs/sim/cxxtest/Make.defs
index 6e8de79d576..eac92e92822 100644
--- a/configs/sim/cxxtest/Make.defs
+++ b/configs/sim/cxxtest/Make.defs
@@ -51,7 +51,7 @@ ARCHWARNINGS		= -Wall -Wstrict-prototypes -Wshadow
 ARCHWARNINGSXX		= -Wall -Wshadow
 ARCHDEFINES		=
 ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
-ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
+ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx -isystem $(TOPDIR)/include/uClibc++
 ARCHSCRIPT		=
 
 ifeq ($(CONFIG_SIM_M32),y)
@@ -101,7 +101,6 @@ ifeq ($(CONFIG_SIM_M32),y)
   LDFLAGS			+= -m32
 endif
 
-
 MKDEP			= $(TOPDIR)/tools/mkdeps.sh
 
 HOSTCC			= gcc