diff --git a/posix.mak b/posix.mak
index 2e6f16686e9..7a9c105c0d5 100644
--- a/posix.mak
+++ b/posix.mak
@@ -348,7 +348,7 @@ UT_D_OBJS:=$(addprefix $(ROOT)/unittest/,$(addsuffix .o,$(D_MODULES)))
 $(UT_D_OBJS): $(ALL_D_FILES)
 $(UT_D_OBJS): $(ROOT)/unittest/%.o: %.d
 	@mkdir -p $(dir $@)
-	$(DMD) $(DFLAGS) $(UDFLAGS) $(aa[$(subst /,.,$(basename $<))]) -c -of$@ $<
+	$(DMD) $(DFLAGS) $(UDFLAGS) -c -of$@ $<
 
 ifneq (1,$(SHARED))