diff --git a/configure.ac b/configure.ac
index ac05f91ddb..4010e7b264 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1095,7 +1095,8 @@ AS_IF([test "x$with_jemalloc" != xno],[
     [test x$with_jemalloc = xyes && with_jemalloc=no])
   AC_CHECK_HEADER(jemalloc/jemalloc.h, [
     AC_DEFINE(RUBY_ALTERNATIVE_MALLOC_HEADER, [<jemalloc/jemalloc.h>])
-  ])
+  ],
+  [test x$with_jemalloc = xyes && with_jemalloc=no])
   AS_IF([test "x$with_jemalloc" != xyes], [
     AC_CACHE_CHECK([for jemalloc with JEMALLOC_MANGLE], rb_cv_jemalloc_demangle,
       [AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@define JEMALLOC_MANGLE 1