diff --git a/src/package/vieter_package.c b/src/package/vieter_package.c
index 5c61d45..bec0bf5 100644
--- a/src/package/vieter_package.c
+++ b/src/package/vieter_package.c
@@ -185,7 +185,7 @@ char *vieter_package_to_description(vieter_package *pkg) {
   int i;
 
   // special case for FILENAME
-  char *ext;
+  char *ext = NULL;
   switch (pkg->compression) {
   case 0:
     ext = ".tar";