diff --git a/Makefile.objs b/Makefile.objs
index 44d7238..aaf6542 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -374,16 +374,14 @@ endif
 
 simpletrace.o: simpletrace.c $(GENERATED_HEADERS)
 
-ifeq ($(TRACE_BACKEND),dtrace)
-trace-obj-y = trace-dtrace.o
-else
+trace-obj-$(CONFIG_TRACE_SYSTEMTAP) += trace-dtrace.o
+ifneq ($(TRACE_BACKEND),dtrace)
 trace-obj-y = trace.o
-ifeq ($(TRACE_BACKEND),simple)
-trace-obj-y += simpletrace.o
-trace-obj-y += qemu-timer-common.o
-endif
 endif
 
+trace-obj-$(CONFIG_TRACE_SIMPLE) += simpletrace.o
+trace-obj-$(CONFIG_TRACE_SIMPLE) += qemu-timer-common.o
+
 ######################################################################
 # smartcard