diff --git a/pkg.c b/pkg.c
index 8838cb1..f87578a 100644
--- a/pkg.c
+++ b/pkg.c
@@ -73,6 +73,9 @@ str_has_suffix(const char *str, const char *suffix)
 void
 pkg_free(pkg_t *pkg)
 {
+	if (pkg == NULL || pkg->flags & PKG_PROPF_VIRTUAL)
+		return;
+
 	if (pkg->id != NULL)
 		free(pkg->id);
 
diff --git a/pkg.h b/pkg.h
index 1ce862c..58b2e6f 100644
--- a/pkg.h
+++ b/pkg.h
@@ -96,6 +96,9 @@ struct tuple_ {
 	char *value;
 };
 
+#define PKG_PROPF_NONE			0x0
+#define PKG_PROPF_VIRTUAL		0x1
+
 struct pkg_ {
 	char *id;
 	char *filename;
@@ -115,6 +118,8 @@ struct pkg_ {
 	pkg_tuple_t *vars;
 
 	bool uninstalled;
+
+	unsigned int flags;
 };
 
 #define PKG_MODULE_SEPARATOR(c) ((c) == ',' || isspace ((c)))