diff --git a/configs/sim/Make.defs b/configs/sim/Make.defs
index 5fa97507d98..8f01a50f2e1 100644
--- a/configs/sim/Make.defs
+++ b/configs/sim/Make.defs
@@ -59,6 +59,10 @@ OBJDUMP			= $(CROSSDEV)objdump
 CFLAGS			= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
 			  $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) -pipe
 
+HOSTINCLUDES		= -I.
+HOSTCFLAGS		= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) -pipe
+
 OBJEXT			= .o
 LIBEXT			= .a
 EXEEXT			=