diff --git a/regression/Makefile b/regression/Makefile
index 0fc4b3f96..bc014ca91 100644
--- a/regression/Makefile
+++ b/regression/Makefile
@@ -13,3 +13,6 @@ $(TESTS): %: %.expr
 
 clean:
 	rm -f test*.log *.s *~ $(TESTS)
+	pushd expressions && make clean && popd
+	pushd deep-expressions && make clean && popd
+	pushd x86only && make clean && popd
diff --git a/regression/deep-expressions/Makefile b/regression/deep-expressions/Makefile
index fe0e5468b..e46f56420 100644
--- a/regression/deep-expressions/Makefile
+++ b/regression/deep-expressions/Makefile
@@ -12,4 +12,5 @@ $(TESTS): %: %.expr
 	@cat $@.input | $(RC) -s $< > $@.log && diff $@.log orig/$@.log
 
 clean:
-	rm -f *.log *.s *~ $(TESTS)
+	rm -f *.log *.s *~
+	find . -maxdepth 1 -type f -not -name '*.*' -not -name 'Makefile' -delete
diff --git a/regression/expressions/Makefile b/regression/expressions/Makefile
index fe0e5468b..3b2afb53a 100644
--- a/regression/expressions/Makefile
+++ b/regression/expressions/Makefile
@@ -12,4 +12,6 @@ $(TESTS): %: %.expr
 	@cat $@.input | $(RC) -s $< > $@.log && diff $@.log orig/$@.log
 
 clean:
-	rm -f *.log *.s *~ $(TESTS)
+	rm -f *.log *.s *~
+	find . -maxdepth 1 -type f -not -name '*.*' -not -name 'Makefile' -delete
+