diff --git a/maxscale-system-test/fw/deny19 b/maxscale-system-test/fw/deny19
new file mode 100644
index 000000000..38771d22a
--- /dev/null
+++ b/maxscale-system-test/fw/deny19
@@ -0,0 +1,2 @@
+SELECT CONCAT(x1) FROM t1;
+SELECT CONCAT("x1") FROM t1;
\ No newline at end of file
diff --git a/maxscale-system-test/fw/deny3 b/maxscale-system-test/fw/deny3
index 0c5f68f1a..5ac12cac6 100644
--- a/maxscale-system-test/fw/deny3
+++ b/maxscale-system-test/fw/deny3
@@ -1,3 +1,4 @@
 update t1 set x1=1 where fl=0;
 SELECT x1 FROM t1;
-select t1.x1 as 'something' from t1 as t1 limit 1;
\ No newline at end of file
+select t1.x1 as 'something' from t1 as t1 limit 1;
+SELECT "x1" FROM t1;
diff --git a/maxscale-system-test/fw/pass19 b/maxscale-system-test/fw/pass19
new file mode 100644
index 000000000..60f69d18e
--- /dev/null
+++ b/maxscale-system-test/fw/pass19
@@ -0,0 +1,6 @@
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (x1 TEXT, x2 TEXT);
+select sleep(5);
+SELECT x1 FROM t1;
+SELECT x2 FROM t1;
+SELECT CONCAT(x2) FROM t1;
diff --git a/maxscale-system-test/fw/rules19 b/maxscale-system-test/fw/rules19
new file mode 100644
index 000000000..7c67d8c3b
--- /dev/null
+++ b/maxscale-system-test/fw/rules19
@@ -0,0 +1,2 @@
+rule test19 match function concat columns x1
+users %@% match any rules test19
diff --git a/maxscale-system-test/fwf.cpp b/maxscale-system-test/fwf.cpp
index af7cd6f1a..c20618d4b 100644
--- a/maxscale-system-test/fwf.cpp
+++ b/maxscale-system-test/fwf.cpp
@@ -44,7 +44,7 @@ int main(int argc, char* argv[])
                                 Test->maxscales->access_homedir[0]);
 
     sprintf(rules_dir, "%s/fw/", test_dir);
-    int N = 18;
+    int N = 19;
     int i;
 
     for (i = 1; i < N + 1; i++)