diff --git a/configs/avr32dev1/nsh/Make.defs b/configs/avr32dev1/nsh/Make.defs
index 57a4881871..730a05f886 100644
--- a/configs/avr32dev1/nsh/Make.defs
+++ b/configs/avr32dev1/nsh/Make.defs
@@ -66,7 +66,7 @@ ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gc
 ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
 
 ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
-  ARCHOPTIMIZATION	= -g
+  ARCHOPTIMIZATION = -g
 endif
 
 ifneq ($(CONFIG_DEBUG_NOOPT),y)
diff --git a/configs/avr32dev1/ostest/Make.defs b/configs/avr32dev1/ostest/Make.defs
index 08e49ef8cf..e231a5753a 100644
--- a/configs/avr32dev1/ostest/Make.defs
+++ b/configs/avr32dev1/ostest/Make.defs
@@ -80,7 +80,7 @@ ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gc
 ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
 
 ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
-  ARCHOPTIMIZATION	= -g
+  ARCHOPTIMIZATION = -g
 endif
 
 ifneq ($(CONFIG_DEBUG_NOOPT),y)