diff --git a/Makefile b/Makefile
index 3f5ca87..e3d2ace 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ cleanprograms:
 	$(RM) bin/calculate
 	$(RM) bin/cut
 	$(RM) bin/echo
+	$(MAKE) -C echo clean
 	$(RM) bin/eq
 	$(RM) bin/false
 	$(RM) bin/fdivide
@@ -27,16 +28,19 @@ cleanprograms:
 	$(RM) bin/nonzero
 	$(RM) bin/pscat
 	$(RM) bin/rot13
+	$(MAKE) -C rot13 clean
 	$(RM) bin/simexec
 	$(RM) bin/sleep
 	$(RM) bin/streq
 	$(RM) bin/str
+	$(MAKE) -C str clean
 	$(RM) bin/substitute
 	$(RM) bin/sysexits
 	$(RM) bin/retval
 	$(RM) bin/rldecode
 	$(RM) bin/rlencode
 	$(RM) bin/roll
+	$(MAKE) -C roll clean
 	$(RM) bin/tail
 	$(RM) bin/true
 
@@ -69,7 +73,7 @@ calculate: libstr sysexits src/calculate.c
 echo: bin/echo
 
 bin/echo: echo/echo
-	mv echo/echo bin/echo
+	cp echo/echo bin/echo
 
 echo/echo: echo/Makefile echo/echo.c
 	$(MAKE) -C echo sane
@@ -98,7 +102,7 @@ nutshell: libio nutshell.o
 pscat: bin/pscat
 
 bin/pscat: pscat/pscat
-	mv pscat/pscat bin/pscat
+	cp pscat/pscat bin/pscat
 
 pscat/pscat: sysexits pscat/pscat.c pscat/Makefile
 	$(MAKE) -C pscat sane
@@ -112,7 +116,7 @@ retval: libio retval.o
 roll: bin/roll
 
 bin/roll: roll/roll
-	mv roll/roll bin/roll
+	cp roll/roll bin/roll
 
 roll/roll: sysexits roll/roll.c roll/Makefile
 	$(MAKE) -C roll sane
@@ -120,7 +124,7 @@ roll/roll: sysexits roll/roll.c roll/Makefile
 rot13: bin/rot13
 
 bin/rot13: rot13/rot13
-	mv rot13/rot13 bin/rot13
+	cp rot13/rot13 bin/rot13
 
 rot13/rot13: sysexits rot13/rot13.c rot13/Makefile
 	$(MAKE) -C rot13 sane
@@ -150,7 +154,7 @@ streq: libio streq.o
 str: bin/str
 
 bin/str: str/str
-	mv str/str bin/str
+	cp str/str bin/str
 
 str/str: sysexits str/str.c str/Makefile
 	$(MAKE) -C str sane