diff --git a/apache2/msc_pcre.c b/apache2/msc_pcre.c
index b0fe70c9a1..16f5efd5d4 100644
--- a/apache2/msc_pcre.c
+++ b/apache2/msc_pcre.c
@@ -80,7 +80,11 @@ void *msc_pregcomp_ex(apr_pool_t *pool, const char *pattern, int options,
         PCRE2_UCHAR buffer[256];
         // Get the error message from the error code
         pcre2_get_error_message(error_number, buffer, sizeof(buffer));
-        *_errptr = apr_pstrdup(pool, buffer);
+#ifdef DEBUG_CONF
+        * _errptr = apr_psprintf(pool, "%s - pattern = %s", buffer, pattern);
+#else
+        * _errptr = apr_pstrdup(pool, buffer);
+#endif
         return NULL;
     }