diff --git a/configure.in b/configure.in
index 8b9407138..d4d10acee 100644
--- a/configure.in
+++ b/configure.in
@@ -84,7 +84,7 @@ AC_ARG_WITH([valgrind], [AS_HELP_STRING([--with-valgrind],
                                         [Add valgrind hooks])],
             [], [check_valgrind=yes])
 
-AS_IF([test "x$check_valgrind" == xyes],
+AS_IF([test "x$check_valgrind" = xyes],
       [AC_MSG_NOTICE([Not using valgrind hooks])],
       [AC_CHECK_HEADER([valgrind/memcheck.h],
                        [AC_DEFINE([CHECK_WITH_VALGRIND], [1],