diff --git a/Makefile.nmake b/Makefile.nmake
index 77be3386c9..6aec541513 100644
--- a/Makefile.nmake
+++ b/Makefile.nmake
@@ -7,6 +7,24 @@
 include config.nmake
 include <win32.mak>
 
+##### Deprecation #####
+# Support for NMake and QMake will be removed in June 2016. Removal includes
+# the following files:
+#
+# Makefile.nmake in the top level and most subdirectories.
+# Makefile.nmake.inc
+# config.nmake
+# epan/dissectors/asn1/Makefile.inc.nmake
+# epan/dissectors/asn1/Makefile.preinc.nmake
+# packaging/nsis/Custom.nmake
+# plugins/*/moduleinfo.nmake
+# tools/native-nmake.cmd
+# tools/win-setup.sh
+#
+# Additionally, the following files reference the nmake environment:
+# make-version.pl
+# The autotools 'dist' target
+
 ############### no need to modify below this line #########
 
 CC = cl
diff --git a/config.nmake b/config.nmake
index 7214485ea0..b363b507f7 100644
--- a/config.nmake
+++ b/config.nmake
@@ -1,6 +1,19 @@
 # Some more information about the settings in this file can be found in
 # the file README.windows and the Developer's Guide (available online).
 
+##### Deprecation #####
+# Support for NMake and QMake will be removed in June 2016.
+# Uncomment the following line or pass YES_I_KNOW_ABOUT_THE_DEPRECATION=1
+# on the command line to override.
+
+#YES_I_KNOW_ABOUT_THE_DEPRECATION=1
+!IFNDEF YES_I_KNOW_ABOUT_THE_DEPRECATION
+!MESSAGE Nmake is being deprecated. Please consider using CMake instead.
+!MESSAGE See https://www.wireshark.org/docs/wsdg_html_chunked/ChSetupWin32.html
+!MESSAGE for details.
+!ERROR Set YES_I_KNOW_ABOUT_THE_DEPRECATION to disable this message.
+!ENDIF
+
 ##### Program name #####
 # Changing the name is experimental and may break the installer/uninstaller and possibly other stuff.
 # Application data will still be under the same dir as Wireshark so preference files, profiles, and etc