diff --git a/Makefile.nmake b/Makefile.nmake
index 4cd04c13..e472e988 100644
--- a/Makefile.nmake
+++ b/Makefile.nmake
@@ -2,7 +2,7 @@
 # tons of important things.  DO NOT RELY ON IT TO BUILD A GOOD LIBEVENT.
 
 # Needed for correctness
-CFLAGS=/IWIN32-Code /Iinclude /Icompat /DWIN32 /DHAVE_CONFIG_H /I.
+CFLAGS=/IWIN32-Code /Iinclude /Icompat /DHAVE_CONFIG_H /I.
 
 # For optimization and warnings
 CFLAGS=$(CFLAGS) /Ox /W3 /wd4996 /nologo
diff --git a/test/Makefile.nmake b/test/Makefile.nmake
index 2c240eec..e361d655 100644
--- a/test/Makefile.nmake
+++ b/test/Makefile.nmake
@@ -1,5 +1,5 @@
 
-CFLAGS=/I.. /I../WIN32-Code /I../include /I../compat /DWIN32 /DHAVE_CONFIG_H /DTINYTEST_LOCAL
+CFLAGS=/I.. /I../WIN32-Code /I../include /I../compat /DHAVE_CONFIG_H /DTINYTEST_LOCAL
 
 CFLAGS=$(CFLAGS) /Ox /W3 /wd4996 /nologo