diff --git a/boards/sparc/bm3803/xx3803/scripts/Make.defs b/boards/sparc/bm3803/xx3803/scripts/Make.defs
index ca29ae7526..ebb9f81a85 100644
--- a/boards/sparc/bm3803/xx3803/scripts/Make.defs
+++ b/boards/sparc/bm3803/xx3803/scripts/Make.defs
@@ -61,13 +61,6 @@ CXXELFFLAGS = $(CXXFLAGS)
 LDELFFLAGS = -r -e main
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)/boards/$(CONFIG_ARCH)/$(CONFIG_ARCH_CHIP)/$(CONFIG_ARCH_BOARD)/scripts/gnu-elf.ld)
 
-# File extensions
-
-ASMEXT = .S
-OBJEXT = .o
-LIBEXT = .a
-EXEEXT = .elf
-
 # Linker flags
 
 ifneq ($(CROSSDEV),sparc-nuttx-elf-)
diff --git a/boards/sparc/bm3823/xx3823/scripts/Make.defs b/boards/sparc/bm3823/xx3823/scripts/Make.defs
index d52a0ac061..15507a3853 100644
--- a/boards/sparc/bm3823/xx3823/scripts/Make.defs
+++ b/boards/sparc/bm3823/xx3823/scripts/Make.defs
@@ -49,8 +49,3 @@ CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS)
 CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
 CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
 AFLAGS = $(CFLAGS) -D__ASSEMBLY__
-
-ASMEXT = .S
-OBJEXT = .o
-LIBEXT = .a
-EXEEXT = .elf