diff --git a/Makefile b/Makefile
index 516f73a..52bbc55 100644
--- a/Makefile
+++ b/Makefile
@@ -104,7 +104,7 @@ multimon:
 static_h: $(MESSAGES_H) $(MESSAGES2_H) $(UBX_PROTOCOL_H) $(XSENS_PROTOCOL_H) $(DL_PROTOCOL_H) $(DL_PROTOCOL2_H)
 
 usb_lib:
-	@[ -d sw/airborne/arch/lpc21/lpcusb ] && ((test -x $(ARMGCC) && (cd sw/airborne/arch/lpc21/lpcusb; $(MAKE))) || echo "Not building usb_lib: ARMGCC=$(ARMGCC) not found") || echo "Not building usb_lib: sw/airborne/arch/lpc21/lpcusb directory missing"
+	@[ -d sw/airborne/arch/lpc21/lpcusb ] && ((test -x "$(ARMGCC)" && (cd sw/airborne/arch/lpc21/lpcusb; $(MAKE))) || echo "Not building usb_lib: ARMGCC=$(ARMGCC) not found") || echo "Not building usb_lib: sw/airborne/arch/lpc21/lpcusb directory missing"
 
 $(MESSAGES_H) : $(MESSAGES_XML) $(CONF_XML) tools
 	$(Q)test -d $(STATICINCLUDE) || mkdir -p $(STATICINCLUDE)