diff --git a/rosapps/applications/net/ncftp/libncftp/syshdrs.h b/rosapps/applications/net/ncftp/libncftp/syshdrs.h
index 302240dd5c7..344db2ec41c 100644
--- a/rosapps/applications/net/ncftp/libncftp/syshdrs.h
+++ b/rosapps/applications/net/ncftp/libncftp/syshdrs.h
@@ -31,7 +31,9 @@
 #	include <sys/types.h>
 #	include <sys/stat.h>
 #	include <fcntl.h>
+#	undef strcasecmp
 #	define strcasecmp stricmp
+#	undef strncasecmp
 #	define strncasecmp strnicmp
 #	define sleep WinSleep
 #	ifndef S_ISREG
diff --git a/rosapps/applications/net/ncftp/ncftp/syshdrs.h b/rosapps/applications/net/ncftp/ncftp/syshdrs.h
index 618eaf6cd54..3a4d6392905 100644
--- a/rosapps/applications/net/ncftp/ncftp/syshdrs.h
+++ b/rosapps/applications/net/ncftp/ncftp/syshdrs.h
@@ -44,7 +44,9 @@
 #	include <fcntl.h>
 #	include <signal.h>
 #	include <assert.h>
+#	undef strcasecmp
 #	define strcasecmp stricmp
+#	undef strncasecmp
 #	define strncasecmp strnicmp
 #	define sleep WinSleep
 #	ifndef S_ISREG
diff --git a/rosapps/applications/net/ncftp/sio/syshdrs.h b/rosapps/applications/net/ncftp/sio/syshdrs.h
index f4483d2ab16..d9c65137a49 100644
--- a/rosapps/applications/net/ncftp/sio/syshdrs.h
+++ b/rosapps/applications/net/ncftp/sio/syshdrs.h
@@ -32,7 +32,9 @@
 #	include <sys/types.h>
 #	include <sys/stat.h>
 #	include <fcntl.h>
+#	undef strcasecmp
 #	define strcasecmp stricmp
+#	undef strncasecmp
 #	define strncasecmp strnicmp
 #	define sleep(a) Sleep(a * 1000)
 #	ifndef S_ISREG