diff --git a/netmap/policy.go b/netmap/policy.go
index 06e1cba..323050e 100644
--- a/netmap/policy.go
+++ b/netmap/policy.go
@@ -471,7 +471,7 @@ func writeFilterStringTo(w io.StringWriter, f netmap.Filter) error {
 	unspecified := op == 0
 
 	if s = f.GetKey(); s != "" {
-		_, err = w.WriteString(fmt.Sprintf("%s %s %s", s, op, f.GetValue()))
+		_, err = w.WriteString(fmt.Sprintf("%s %s %s", escapeString(s), op, escapeString(f.GetValue())))
 		if err != nil {
 			return err
 		}
@@ -816,3 +816,12 @@ func operationFromString(s string) (op netmap.Operation) {
 
 	return
 }
+
+// escapeString returns single quote wrapped string if it contains special
+// characters '-' and whitespace.
+func escapeString(s string) string {
+	if strings.ContainsAny(s, " -\t") {
+		return "'" + s + "'"
+	}
+	return s
+}
diff --git a/netmap/policy_test.go b/netmap/policy_test.go
index 75167dc..98ce5f2 100644
--- a/netmap/policy_test.go
+++ b/netmap/policy_test.go
@@ -31,6 +31,10 @@ FILTER NOT (NOT (City EQ SPB) AND SSD EQ true OR City EQ SPB AND Rating GE 5) AS
 		`UNIQUE
 REP 1
 REP 1`,
+
+		`REP 1 IN X
+SELECT 1 FROM F AS X
+FILTER 'UN-LOCODE' EQ 'RU LED' AS F`,
 	}
 
 	var p PlacementPolicy