diff --git a/ChangeLog b/ChangeLog
index dbfed5fdc7..1c425e2aa2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Aug 21 14:20:58 2011  Naohisa Goto  <ngotogenome@gmail.com>
+
+	* configure.in: use LD_LIBRARY_PATH_64 on 64-bit Solaris.
+
 Sat Aug 20 13:19:52 2011  Kazuki Tsujimoto  <kazuki@callcc.net>
 
 	* iseq.c (iseq_s_disasm): fix a bug that may cause SEGV.
diff --git a/configure.in b/configure.in
index a40a8888cd..53f0a72da7 100644
--- a/configure.in
+++ b/configure.in
@@ -2019,6 +2019,9 @@ if test "$with_dln_a_out" != yes; then
 			else
 			    : ${LDSHARED='$(CC) -G'}
 			fi
+			if test "$ac_cv_sizeof_voidp" = 8; then
+			    : ${LIBPATHENV=LD_LIBRARY_PATH_64}
+			fi
 			rb_cv_dlopen=yes],
 	[sunos*], [	: ${LDSHARED='ld -assert nodefinitions'}
 			rb_cv_dlopen=yes],