diff --git a/src/cmd_fetch.zig b/src/cmd_fetch.zig
index 0e442e09b4ce28519dd07a01dbf3b890562b8249..a808efe156fb178fde867249f884ac51c6c5b8b2 100644
--- a/src/cmd_fetch.zig
+++ b/src/cmd_fetch.zig
@@ -55,7 +55,7 @@ pub fn execute(args: [][]u8) !void {
     });
 
     const list = &std.ArrayList(u.Module).init(gpa);
-    try collect_pkgs(top_module, list);
+    try common.collect_pkgs(top_module, list);
 
     try w.writeAll("pub const _ids = .{\n");
     try print_ids(w, list.items);
@@ -202,17 +202,6 @@ fn print_sys_libs_to(w: fs.File.Writer, list: []u.Module, list2: *std.ArrayList(
     }
 }
 
-fn collect_pkgs(mod: u.Module, list: *std.ArrayList(u.Module)) anyerror!void {
-    //
-    if (u.list_contains_gen(u.Module, list, mod)) {
-        return;
-    }
-    try list.append(mod);
-    for (mod.deps) |d| {
-        try collect_pkgs(d, list);
-    }
-}
-
 fn print_pkg_data_to(w: fs.File.Writer, list: *std.ArrayList(u.Module), list2: *std.ArrayList(u.Module)) anyerror!void {
     var i: usize = 0;
     while (i < list.items.len) : (i += 1) {
diff --git a/src/common.zig b/src/common.zig
index b418fdcc6245ca89ac46006840aeeff9e88b4e7c..a4449730712862084f96479111087a767af5d428 100644
--- a/src/common.zig
+++ b/src/common.zig
@@ -154,3 +154,13 @@ pub fn collect_deps(dir: []const u8, mpath: []const u8, comptime options: Collec
         .except_os = &[_][]const u8{},
     };
 }
+
+pub fn collect_pkgs(mod: u.Module, list: *std.ArrayList(u.Module)) anyerror!void {
+    if (u.list_contains_gen(u.Module, list, mod)) {
+        return;
+    }
+    try list.append(mod);
+    for (mod.deps) |d| {
+        try collect_pkgs(d, list);
+    }
+}