diff --git a/filtering.go b/filtering.go
index ec68510..4f11fa4 100644
--- a/filtering.go
+++ b/filtering.go
@@ -50,6 +50,7 @@ func ParseFilters(req *http.Request, header string) (filters Filter) {
 	return filters
 }
 
+// TODO(marko): very dodgy, needs more robustness
 func MakeFilterString(prefix string, filters Filter, validFilters []string) (res string, ok bool) {
 	if prefix != "" {
 		prefix += "."
@@ -63,13 +64,22 @@ func MakeFilterString(prefix string, filters Filter, validFilters []string) (res
 		return "", ok
 	}
 
+	symbol := "="
 	for k, v := range filters {
 		if res != "" {
 			res += " and "
 		} else {
 			res += " where "
 		}
-		res += fmt.Sprintf("%s%s = '%s'", prefix, k, v)
+		c := string(v[0])
+		if c == "<" || c == ">" {
+			symbol = c
+			v = string(v[1:])
+		} else {
+			symbol = "="
+		}
+
+		res += fmt.Sprintf("%s%s %s '%s'", prefix, k, symbol, v)
 	}
 
 	return res, ok