diff --git a/desk.acc/Makefile b/desk.acc/Makefile
index 0191a48..b219f40 100644
--- a/desk.acc/Makefile
+++ b/desk.acc/Makefile
@@ -20,8 +20,7 @@ $(OUTDIR):
 clean:
 	rm -f $(OUTDIR)/*.o
 	rm -f $(OUTDIR)/*.list
-	rm -f $(OUTDIR)/*.built
-	rm -f $(OUTDIR)/*.sys
+	rm -f $(TARGETS)
 
 $(OUTDIR)/%.o: %.s $(HEADERS)
 	$(CC65)/ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<
diff --git a/desktop.system/Makefile b/desktop.system/Makefile
index e51dc04..9acbc3f 100644
--- a/desktop.system/Makefile
+++ b/desktop.system/Makefile
@@ -18,9 +18,7 @@ $(OUTDIR):
 clean:
 	rm -f $(OUTDIR)/*.o
 	rm -f $(OUTDIR)/*.list
-	rm -f $(OUTDIR)/*.inc
-	rm -f $(OUTDIR)/*.built
-	rm -f $(OUTDIR)/*.SYS
+	rm -f $(TARGETS)
 
 $(OUTDIR)/%.o: %.s $(HEADERS)
 	$(CC65)/ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<
diff --git a/desktop/Makefile b/desktop/Makefile
index 25f093a..05e801d 100644
--- a/desktop/Makefile
+++ b/desktop/Makefile
@@ -20,9 +20,8 @@ $(OUTDIR):
 clean:
 	rm -f $(OUTDIR)/*.o
 	rm -f $(OUTDIR)/*.list
-	rm -f $(OUTDIR)/*.inc
 	rm -f $(OUTDIR)/*.built
-	rm -f $(OUTDIR)/*.sys
+	rm -f $(TARGETS)
 
 $(OUTDIR)/desktop.o: desktop.s $(HEADERS) desktop_* ovl*.s
 	$(CC65)/ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<
diff --git a/ram.system/Makefile b/ram.system/Makefile
index b993f99..1774e32 100644
--- a/ram.system/Makefile
+++ b/ram.system/Makefile
@@ -18,9 +18,7 @@ $(OUTDIR):
 clean:
 	rm -f $(OUTDIR)/*.o
 	rm -f $(OUTDIR)/*.list
-	rm -f $(OUTDIR)/*.inc
-	rm -f $(OUTDIR)/*.built
-	rm -f $(OUTDIR)/*.SYS
+	rm -f $(TARGETS)
 
 $(OUTDIR)/%.o: %.s $(HEADERS)
 	$(CC65)/ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<