diff --git a/lib/efm32/ezr32wg/Makefile b/lib/efm32/ezr32wg/Makefile
index 0fafd501..70b1a252 100644
--- a/lib/efm32/ezr32wg/Makefile
+++ b/lib/efm32/ezr32wg/Makefile
@@ -44,7 +44,7 @@ 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            += usb.o usb_control.o usb_standard.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/lg/Makefile b/lib/efm32/lg/Makefile
index 0d4bf4a1..a0163677 100644
--- a/lib/efm32/lg/Makefile
+++ b/lib/efm32/lg/Makefile
@@ -44,7 +44,7 @@ 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            += usb.o usb_control.o usb_standard.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 1fccbfdc..f2a767c5 100644
--- a/lib/efm32/wg/Makefile
+++ b/lib/efm32/wg/Makefile
@@ -44,7 +44,7 @@ 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            += usb.o usb_control.o usb_standard.o
+OBJS            += usb.o usb_control.o usb_standard.o usb_msc.o
 OBJS            += usb_efm32.o
 
 VPATH += ../../usb:../:../../cm3:../common