diff --git a/lib/efm32/ezr32wg/Makefile b/lib/efm32/ezr32wg/Makefile
index 1a8f2a08..75bd7a3f 100644
--- a/lib/efm32/ezr32wg/Makefile
+++ b/lib/efm32/ezr32wg/Makefile
@@ -36,14 +36,17 @@ TGT_CFLAGS	= -Os \
 TGT_CFLAGS      += $(DEBUG_FLAGS)
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
-OBJS		=
 
-OBJS		= gpio_common.o cmu_common.o prs_common.o
-OBJS		+= adc_common.o dma_common.o timer_common.o
-OBJS		+= dac_common.o
+OBJS += adc_common.o
+OBJS += cmu_common.o
+OBJS += dac_common.o
+OBJS += dma_common.o
+OBJS += gpio_common.o
+OBJS += prs_common.o
+OBJS += timer_common.o
 
-OBJS            += usb.o usb_control.o usb_standard.o usb_msc.o
-OBJS            += usb_efm32.o
+OBJS += usb.o usb_control.o usb_standard.o usb_msc.o
+OBJS += usb_efm32.o
 
 VPATH += ../../usb:../:../../cm3:../common
 
diff --git a/lib/efm32/hg/Makefile b/lib/efm32/hg/Makefile
index fe59d9b9..c6f7ba5a 100644
--- a/lib/efm32/hg/Makefile
+++ b/lib/efm32/hg/Makefile
@@ -38,9 +38,12 @@ TGT_CFLAGS	+= $(STANDARD_FLAGS)
 
 ARFLAGS		= rcs
 
-OBJS		= cmu.o gpio_common.o timer_common.o
-OBJS		+= usb.o usb_control.o usb_standard.o usb_msc.o \
-		   usb_dwc_common.o usb_efm32hg.o
+OBJS += cmu.o
+OBJS += gpio_common.o
+OBJS += timer_common.o
+
+OBJS += usb.o usb_control.o usb_standard.o usb_msc.o
+OBJS += usb_dwc_common.o usb_efm32hg.o
 
 VPATH += ../../usb:../:../../cm3:../common
 
diff --git a/lib/efm32/lg/Makefile b/lib/efm32/lg/Makefile
index a5010169..7da85ca0 100644
--- a/lib/efm32/lg/Makefile
+++ b/lib/efm32/lg/Makefile
@@ -36,14 +36,17 @@ TGT_CFLAGS      += $(DEBUG_FLAGS)
 TGT_CFLAGS	+= $(STANDARD_FLAGS)
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
-OBJS		=
 
-OBJS		= gpio_common.o cmu_common.o prs_common.o
-OBJS		+= adc_common.o dma_common.o timer_common.o
-OBJS		+= dac_common.o
+OBJS += adc_common.o
+OBJS += cmu_common.o
+OBJS += dac_common.o
+OBJS += dma_common.o
+OBJS += gpio_common.o
+OBJS += prs_common.o
+OBJS += timer_common.o
 
-OBJS            += usb.o usb_control.o usb_standard.o usb_msc.o
-OBJS            += usb_efm32.o
+OBJS += usb.o usb_control.o usb_standard.o usb_msc.o
+OBJS += usb_efm32.o
 
 VPATH += ../../usb:../:../../cm3:../common
 
diff --git a/lib/efm32/wg/Makefile b/lib/efm32/wg/Makefile
index 4909c24e..e089defd 100644
--- a/lib/efm32/wg/Makefile
+++ b/lib/efm32/wg/Makefile
@@ -36,14 +36,17 @@ TGT_CFLAGS	= -Os \
 TGT_CFLAGS      += $(DEBUG_FLAGS)
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
-OBJS		=
 
-OBJS		= gpio_common.o cmu_common.o prs_common.o
-OBJS		+= adc_common.o dma_common.o timer_common.o
-OBJS		+= dac_common.o
+OBJS += adc_common.o
+OBJS += cmu_common.o
+OBJS += dac_common.o
+OBJS += dma_common.o
+OBJS += gpio_common.o
+OBJS += prs_common.o
+OBJS += timer_common.o
 
-OBJS            += usb.o usb_control.o usb_standard.o usb_msc.o
-OBJS            += usb_efm32.o
+OBJS += usb.o usb_control.o usb_standard.o usb_msc.o
+OBJS += usb_efm32.o
 
 VPATH += ../../usb:../:../../cm3:../common