diff --git a/ChangeLog b/ChangeLog
index 6c0c4bbddb..a23756b77e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Mar  2 21:15:00 2011  Tanaka Akira  <akr@fsij.org>
+
+	* ext/openssl/ossl_pkey_dsa.c: parenthesize macro arguments.
+
 Thu Mar  3 22:10:26 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* process.c (check_exec_redirect_fd, check_exec_redirect): raise
diff --git a/ext/openssl/ossl_pkey_dsa.c b/ext/openssl/ossl_pkey_dsa.c
index e66f4ed009..65550ca351 100644
--- a/ext/openssl/ossl_pkey_dsa.c
+++ b/ext/openssl/ossl_pkey_dsa.c
@@ -13,8 +13,8 @@
 #include "ossl.h"
 
 #define GetPKeyDSA(obj, pkey) do { \
-    GetPKey(obj, pkey); \
-    if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DSA) { /* PARANOIA? */ \
+    GetPKey((obj), (pkey)); \
+    if (EVP_PKEY_type((pkey)->type) != EVP_PKEY_DSA) { /* PARANOIA? */ \
 	ossl_raise(rb_eRuntimeError, "THIS IS NOT A DSA!"); \
     } \
 } while (0)