diff --git a/src/cmd_fetch.zig b/src/cmd_fetch.zig
index d80a9c4fa41e051bf82d6ab27aa0c10e57dc9434..bac4a09ea5485ef7a47cbda4e98bdbc9a9760737 100644
--- a/src/cmd_fetch.zig
+++ b/src/cmd_fetch.zig
@@ -69,8 +69,8 @@ fn fetch_deps(dir: []const u8, mpath: []const u8) anyerror!u.Module {
     const moduledeps = &std.ArrayList(u.Module).init(gpa);
     var moddir: []const u8 = undefined;
     for (m.deps) |d| {
-        const p = try u.concat(&[_][]const u8{dir, "/", try d.clean_path()});
-        const pv = try u.concat(&[_][]const u8{dir, "/v/", try d.clean_path(), "/", d.version});
+        const p = try fs.path.join(gpa, &[_][]const u8{dir, try d.clean_path()});
+        const pv = try fs.path.join(gpa, &[_][]const u8{dir, "v", try d.clean_path(), d.version});
         u.print("fetch: {}: {}: {}", .{m.name, @tagName(d.type), d.path});
         moddir = p;
         switch (d.type) {
diff --git a/src/common.zig b/src/common.zig
index 730cfcc3664dfdad048d67d6e3f57c04ed1cb176..d2f8b0514cb699640db73645293bc494447474b0 100644
--- a/src/common.zig
+++ b/src/common.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const gpa = std.heap.c_allocator;
+const fs = std.fs;
 
 const u = @import("./util/index.zig");
 
@@ -11,8 +12,8 @@ pub fn collect_deps(dir: []const u8, mpath: []const u8) anyerror!u.Module {
     const moduledeps = &std.ArrayList(u.Module).init(gpa);
     var moddir: []const u8 = undefined;
     for (m.deps) |d| {
-        const p = try u.concat(&[_][]const u8{dir, "/", try d.clean_path()});
-        const pv = try u.concat(&[_][]const u8{dir, "/v/", try d.clean_path(), "/", d.version});
+        const p = try fs.path.join(gpa, &[_][]const u8{dir, try d.clean_path()});
+        const pv = try fs.path.join(gpa, &[_][]const u8{dir, "v", try d.clean_path(), d.version});
         if (try u.does_file_exist(pv)) {
             moddir = pv;
         } else {