1 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/names.cc b/src/libexpr/names.cc
index 7bca9b6550be..6d78d2116121 100644
--- a/src/libexpr/names.cc
+++ b/src/libexpr/names.cc
@@ -33,8 +33,8 @@ DrvName::DrvName(const string & s) : hits(0)
 bool DrvName::matches(DrvName & n)
 {
     if (name != "*") {
-        if (!regex) regex = std::shared_ptr<Regex>(new Regex(name));
-        if (!regex->matches(n.name)) return false;
+        if (!regex) regex = std::unique_ptr<std::regex>(new std::regex(name, std::regex::extended));
+        if (!std::regex_match(n.name, *regex)) return false;
     }
     if (version != "" && version != n.version) return false;
     return true;