diff --git a/ChangeLog b/ChangeLog
index 5f46c2efa4..4ef1d71605 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,10 @@
-Thu Jun  5 14:16:41 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Jun  5 14:36:24 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (jemalloc): check for the header regardless drop-in
+	  libjemalloc is found, for `malloc_conf` declaration.
+
+	* version.c (ruby_show_version): show `malloc_conf` if set.
+	  [Feature #9113]
 
 	* configure.in (with-jemalloc): also check for header, for ABIs
 	  which JEMALLOC_MANGLE is needed, i.e., Mach-O and PE-COFF
diff --git a/configure.in b/configure.in
index 555c323321..cfd9065514 100644
--- a/configure.in
+++ b/configure.in
@@ -1178,12 +1178,10 @@ AC_ARG_WITH([jemalloc],
   [with_jemalloc=yes], [with_jemalloc=no])
 AS_IF([test "x$with_jemalloc" = xyes],[
   AC_CHECK_LIB([jemalloc],[malloc_conf],[], [with_jemalloc=no])
-  AS_IF([test "x$with_jemalloc" != xyes],[
-    AC_CHECK_HEADER(jemalloc/jemalloc.h, [
-      AC_DEFINE(RUBY_ALTERNATIVE_MALLOC_HEADER, [<jemalloc/jemalloc.h>])
-      AC_DEFINE(JEMALLOC_MANGLE)
-      with_jemalloc=yes
-    ])
+  AC_CHECK_HEADER(jemalloc/jemalloc.h, [
+    AC_DEFINE(RUBY_ALTERNATIVE_MALLOC_HEADER, [<jemalloc/jemalloc.h>])
+    AC_DEFINE(JEMALLOC_MANGLE)
+    with_jemalloc=yes
   ])
   AS_IF([test "x$with_jemalloc" = xyes],
     [
diff --git a/version.c b/version.c
index 573cf619bd..b2a4d2d25e 100644
--- a/version.c
+++ b/version.c
@@ -78,6 +78,9 @@ void
 ruby_show_version(void)
 {
     PRINT(description);
+#ifdef HAVE_MALLOC_CONF
+    if (malloc_conf) printf("malloc_conf=%s\n", malloc_conf);
+#endif
     fflush(stdout);
 }