diff --git a/debian/xsfbs/xsfbs.mk b/debian/xsfbs/xsfbs.mk
index 984e81c..f0f8953 100755
--- a/debian/xsfbs/xsfbs.mk
+++ b/debian/xsfbs/xsfbs.mk
@@ -110,10 +110,15 @@ $(STAMP_DIR)/stampdir:
 .PHONY: prepare
 stampdir_targets+=prepare
 prepare: $(STAMP_DIR)/prepare
-$(STAMP_DIR)/prepare: $(STAMP_DIR)/stampdir $(STAMP_DIR)/genscripts
-	mkdir -p $(STAMP_DIR)/log
+$(STAMP_DIR)/prepare: $(STAMP_DIR)/log $(STAMP_DIR)/genscripts
 	>$@
 
+.PHONY: log
+stampdir_targets+=log
+log: $(STAMP_DIR)/log
+$(STAMP_DIR)/log: $(STAMP_DIR)/stampdir
+	mkdir -p $(STAMP_DIR)/log
+
 # Apply all patches to the upstream source.
 .PHONY: patch
 stampdir_targets+=patch
@@ -140,7 +145,7 @@ $(STAMP_DIR)/patch: $(STAMP_DIR)/prepare
 
 # Revert all patches to the upstream source.
 .PHONY: unpatch
-unpatch: $(STAMP_DIR)/prepare
+unpatch: $(STAMP_DIR)/log
 	rm -f $(STAMP_DIR)/patch
 	@echo -n "Unapplying patches..."; \
 	if $(QUILT) applied >/dev/null 2>/dev/null; then \