diff --git a/deb/package.go b/deb/package.go
index a50ce44f..f52042ec 100644
--- a/deb/package.go
+++ b/deb/package.go
@@ -411,6 +411,8 @@ func (p *Package) PoolDirectory() (string, error) {
 	source := p.Source
 	if source == "" {
 		source = p.Name
+	} else if pos := strings.Index(source, "("); pos != -1 {
+		source = strings.TrimSpace(source[:pos])
 	}
 
 	if len(source) < 2 {
diff --git a/deb/package_test.go b/deb/package_test.go
index 0105d4b7..4c47ac04 100644
--- a/deb/package_test.go
+++ b/deb/package_test.go
@@ -230,6 +230,12 @@ func (s *PackageSuite) TestPoolDirectory(c *C) {
 	c.Check(err, IsNil)
 	c.Check(dir, Equals, "liba/libarena")
 
+	p = NewPackageFromControlFile(packageStanza.Copy())
+	p.Source = "gcc-defaults (1.77)"
+	dir, err = p.PoolDirectory()
+	c.Check(err, IsNil)
+	c.Check(dir, Equals, "g/gcc-defaults")
+
 	p = NewPackageFromControlFile(packageStanza.Copy())
 	p.Source = "l"
 	_, err = p.PoolDirectory()