diff --git a/ChangeLog b/ChangeLog
index 36062acd6e..3c2bb980f5 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -11715,3 +11715,5 @@
 	  From Young (2016-05-07).
 	* drivrs/mtd:  Add a driver for SST26F spi/qspi flash devices (SPI mode
 	  only).  From Sebastien Lorquet (2016-05-10).
+	* Several Makefiles: Add .PHONY definitions to prevent 'clean up to date'
+	  message weirdness (2016-05-10).
diff --git a/audio/Makefile b/audio/Makefile
index 33b3a26a79..42ee4ea319 100644
--- a/audio/Makefile
+++ b/audio/Makefile
@@ -62,6 +62,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libaudio$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/binfmt/Makefile b/binfmt/Makefile
index 5c5244d89b..7240ca9b15 100644
--- a/binfmt/Makefile
+++ b/binfmt/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # nxflat/Makefile
 #
-#   Copyright (C) 2007-2009, 2012-2015 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2007-2009, 2012-2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -80,6 +80,7 @@ BINFMT_OBJS = $(BINFMT_AOBJS) $(BINFMT_COBJS)
 BIN = libbinfmt$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(BINFMT_AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/configs/Makefile b/configs/Makefile
index 4e96cc8dfd..496601da0b 100644
--- a/configs/Makefile
+++ b/configs/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # configs/Makefile
 #
-#   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -58,6 +58,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libconfigs$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
@@ -84,4 +85,4 @@ distclean: clean
 	$(call DELFILE, Make.dep)
 	$(call DELFILE, .depend)
 
--include Make.dep
\ No newline at end of file
+-include Make.dep
diff --git a/crypto/Makefile b/crypto/Makefile
index c56640534e..23b4cf137e 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # crypto/Makefile
 #
-#   Copyright (C) 2007, 2008, 2011-2014 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2007, 2008, 2011-2014, 2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -70,6 +70,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libcrypto$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/drivers/Makefile b/drivers/Makefile
index 025444990f..224cd78f6e 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # drivers/Makefile
 #
-#   Copyright (C) 2007-2014 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2007-2014, 2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -108,6 +108,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libdrivers$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/fs/Makefile b/fs/Makefile
index e60af07ae0..5ef45f84ee 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # fs/Makefile
 #
-#   Copyright (C) 2007, 2008, 2011-2014 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2007, 2008, 2011-2014, 2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -84,6 +84,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libfs$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/lib/Makefile b/lib/Makefile
index 58857dbd41..92a774d28a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # lib/Makefile
 #
-#   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2012, 2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -36,6 +36,7 @@
 -include $(TOPDIR)/Make.defs
 
 all:
+.PHONY: depend clean distclean
 
 depend:
 
diff --git a/libxx/Makefile b/libxx/Makefile
index 2fee701186..02402dbf7d 100644
--- a/libxx/Makefile
+++ b/libxx/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # libxx/Makefile
 #
-#   Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2009, 2012, 2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -88,6 +88,7 @@ OBJS = $(AOBJS) $(COBJS) $(CXXOBJS)
 BIN = libcxx$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/net/Makefile b/net/Makefile
index 5cfc2349e2..2487ce9609 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # net/Makefile
 #
-#   Copyright (C) 2007, 2008, 2011-2015 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2007, 2008, 2011-2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -75,18 +75,19 @@ include procfs/Make.defs
 include utils/Make.defs
 endif
 
-ASRCS		= $(SOCK_ASRCS) $(NETDEV_ASRCS) $(NET_ASRCS)
-AOBJS		= $(ASRCS:.S=$(OBJEXT))
+ASRCS = $(SOCK_ASRCS) $(NETDEV_ASRCS) $(NET_ASRCS)
+AOBJS = $(ASRCS:.S=$(OBJEXT))
 
-CSRCS		= $(SOCK_CSRCS) $(NETDEV_CSRCS) $(NET_CSRCS)
-COBJS		= $(CSRCS:.c=$(OBJEXT))
+CSRCS = $(SOCK_CSRCS) $(NETDEV_CSRCS) $(NET_CSRCS)
+COBJS = $(CSRCS:.c=$(OBJEXT))
 
-SRCS		= $(ASRCS) $(CSRCS)
-OBJS		= $(AOBJS) $(COBJS)
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
 
-BIN		= libnet$(LIBEXT)
+BIN = libnet$(LIBEXT)
 
-all:	$(BIN)
+all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)
diff --git a/wireless/Makefile b/wireless/Makefile
index 85f69bd118..008d23ff1c 100644
--- a/wireless/Makefile
+++ b/wireless/Makefile
@@ -69,6 +69,7 @@ OBJS = $(AOBJS) $(COBJS)
 BIN = libwireless$(LIBEXT)
 
 all: $(BIN)
+.PHONY: depend clean distclean
 
 $(AOBJS): %$(OBJEXT): %.S
 	$(call ASSEMBLE, $<, $@)