diff --git a/auto/lib/pcre/conf b/auto/lib/pcre/conf
index 6a8c326..3458600 100644
--- a/auto/lib/pcre/conf
+++ b/auto/lib/pcre/conf
@@ -172,6 +172,7 @@
             ngx_feature="PCRE JIT support"
             ngx_feature_name="NGX_HAVE_PCRE_JIT"
             ngx_feature_test="int jit = 0;
+                              pcre_free_study(NULL);
                               pcre_config(PCRE_CONFIG_JIT, &jit);
                               if (jit != 1) return 1;"
             . auto/feature