diff --git a/configure.ac b/configure.ac
index bfafdcd..779a4d9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -49,7 +49,7 @@ AC_ARG_ENABLE(debug,
 AC_ARG_WITH([malloc],
     AS_HELP_STRING([--without-malloc], [Use the default malloc]))
 
-AS_IF([test "x$with_malloc" != "xno"],
+AS_IF([test "x$with_malloc" == "xjemalloc"],
     [AC_CHECK_HEADERS([jemalloc/jemalloc.h], [
         found_jemalloc=yes; break
      ])])
diff --git a/tests/bench_str.csv b/tests/bench_str.csv
index e8dd1f9..a10d1c5 100644
--- a/tests/bench_str.csv
+++ b/tests/bench_str.csv
@@ -442,3 +442,4 @@
 1400668268,13174604.57
 1400668574,13632260.72
 1400681414,10832905.89
+1400685490,13185955.87