diff --git a/ChangeLog b/ChangeLog
index 176042651d..936407865b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Oct 18 11:22:52 2015  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* dln.c: remove defined(__WATCOMC__).
+
 Sun Oct 18 11:16:33 2015  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* lib/mkmf.rb: Good-by Borland-C.
diff --git a/dln.c b/dln.c
index c49a35c006..5372c038a5 100644
--- a/dln.c
+++ b/dln.c
@@ -106,7 +106,7 @@ dln_loaderror(const char *format, ...)
 # define USE_DLN_DLOPEN
 #endif
 
-#if defined(__hp9000s300) || ((defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)) && !defined(__ELF__)) || defined(NeXT) || defined(__WATCOMC__) || defined(MACOSX_DYLD)
+#if defined(__hp9000s300) || ((defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)) && !defined(__ELF__)) || defined(NeXT) || defined(MACOSX_DYLD)
 # define EXTERNAL_PREFIX "_"
 #else
 # define EXTERNAL_PREFIX ""