diff --git a/boards/sim/sim/sim/configs/cxxtest/Make.defs b/boards/sim/sim/sim/configs/cxxtest/Make.defs
index 47f169a7493..7a21d73d25c 100644
--- a/boards/sim/sim/sim/configs/cxxtest/Make.defs
+++ b/boards/sim/sim/sim/configs/cxxtest/Make.defs
@@ -71,9 +71,9 @@ ifeq ($(CONFIG_SIM_M32),y)
 endif
 
 CROSSDEV =
-CC = $(CROSSDEV)gcc
-CXX = $(CROSSDEV)g++
-CPP = $(CROSSDEV)gcc -E
+CC = $(CROSSDEV)cc
+CXX = $(CROSSDEV)c++
+CPP = $(CROSSDEV)cc -E
 LD = $(CROSSDEV)ld
 STRIP = $(CROSSDEV)strip --strip-unneeded
 AR = $(CROSSDEV)ar rcs
@@ -133,7 +133,7 @@ endif
 
 MKDEP = $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
 
-HOSTCC = gcc
+HOSTCC = cc
 HOSTINCLUDES = -I.
 HOSTCFLAGS = $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
    $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
diff --git a/boards/sim/sim/sim/configs/nsh2/Make.defs b/boards/sim/sim/sim/configs/nsh2/Make.defs
index 680efd6df75..778280b1dd4 100644
--- a/boards/sim/sim/sim/configs/nsh2/Make.defs
+++ b/boards/sim/sim/sim/configs/nsh2/Make.defs
@@ -68,9 +68,9 @@ ifeq ($(CONFIG_SIM_M32),y)
 endif
 
 CROSSDEV		=
-CC			= $(CROSSDEV)gcc
-CXX			= $(CROSSDEV)g++
-CPP			= $(CROSSDEV)gcc -E
+CC			= $(CROSSDEV)cc
+CXX			= $(CROSSDEV)c++
+CPP			= $(CROSSDEV)cc -E
 LD			= $(CROSSDEV)ld
 AR			= $(CROSSDEV)ar rcs
 NM			= $(CROSSDEV)nm
@@ -126,7 +126,7 @@ endif
 
 MKDEP			= $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
 
-HOSTCC			= gcc
+HOSTCC			= cc
 HOSTINCLUDES		= -I.
 HOSTCFLAGS		= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
 			  $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
diff --git a/boards/sim/sim/sim/scripts/Make.defs b/boards/sim/sim/sim/scripts/Make.defs
index b1fca660d4d..b2164c6e71d 100644
--- a/boards/sim/sim/sim/scripts/Make.defs
+++ b/boards/sim/sim/sim/scripts/Make.defs
@@ -74,9 +74,9 @@ ifeq ($(CONFIG_SIM_M32),y)
 endif
 
 CROSSDEV =
-CC = $(CROSSDEV)gcc
-CXX = $(CROSSDEV)g++
-CPP = $(CROSSDEV)gcc -E
+CC = $(CROSSDEV)cc
+CXX = $(CROSSDEV)c++
+CPP = $(CROSSDEV)cc -E
 LD = $(CROSSDEV)ld
 STRIP = $(CROSSDEV)strip --strip-unneeded
 AR = $(CROSSDEV)ar rcs
@@ -133,7 +133,7 @@ endif
 
 MKDEP = $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
 
-HOSTCC = gcc
+HOSTCC = cc
 HOSTINCLUDES = -I.
 HOSTCFLAGS = $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
    $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe