diff --git a/.travis.yml b/.travis.yml
index a99d848057..0f7e924b3d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,7 @@ env:
   - OPTS="--without-curl $OPTS"
   - OPTS="--without-yajl $OPTS"
   - OPTS="--without-geoip $OPTS"
-  - OPTS="--without-lmdb $OPTS"
+  - OPTS="--with-lmdb $OPTS"
   - OPTS="--without-ssdeep $OPTS"
   - OPTS="--without-lua $OPTS"
   - OPTS="--without-maxmind $OPTS"
@@ -36,6 +36,7 @@ before_script:
   - '[ "$TRAVIS_OS_NAME" != osx ] || brew update'
   - '[ "$TRAVIS_OS_NAME" != osx ] || brew install cppcheck'
   - '[ "$TRAVIS_OS_NAME" != osx ] || brew install libmaxminddb'
+  - '[ "$TRAVIS_OS_NAME" != osx ] || brew install lmdb'
   - '[ "$TRAVIS_OS_NAME" != linux ] || sudo add-apt-repository --yes ppa:maxmind/ppa'
   - '[ "$TRAVIS_OS_NAME" != linux ] || sudo apt-get update'
   - '[ "$TRAVIS_OS_NAME" != linux ] || sudo apt-cache search maxmind'
diff --git a/src/collection/backend/lmdb.cc b/src/collection/backend/lmdb.cc
index 9a814875e2..2b8724c786 100644
--- a/src/collection/backend/lmdb.cc
+++ b/src/collection/backend/lmdb.cc
@@ -538,7 +538,7 @@ void LMDB::resolveRegularExpression(const std::string& var,
     MDB_cursor *cursor;
     size_t pos;
 
-    Utils::Regex r = Utils::Regex(var);
+    Utils::Regex r(var);
 
     rc = mdb_txn_begin(m_env, NULL, 0, &txn);
     lmdb_debug(rc, "txn", "resolveRegularExpression");
diff --git a/test/regression/regression.cc b/test/regression/regression.cc
index f84f414c04..46da615e4a 100644
--- a/test/regression/regression.cc
+++ b/test/regression/regression.cc
@@ -15,6 +15,8 @@
 
 #include <string.h>
 
+#include <unistd.h>
+
 #include <ctime>
 #include <iostream>
 #include <string>
@@ -136,6 +138,12 @@ void perform_unit_test(ModSecurityTest<RegressionTest> *test,
             continue;
         }
 
+#ifdef WITH_LMDB
+        // some tests (e.g. issue-1831.json)  don't like it when data persists between runs
+        unlink("./modsec-shared-collections");
+        unlink("./modsec-shared-collections-lock");
+#endif
+
         modsec = new modsecurity::ModSecurity();
         modsec->setConnectorInformation("ModSecurity-regression v0.0.1-alpha" \
             " (ModSecurity regression test utility)");