diff --git a/.gitignore b/.gitignore
index 9fa6f71cc..feda423c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@
 # -andrewrk
 
 zig-cache/
+zig-out/
 /release/
 /debug/
 /build/
diff --git a/lib/std/build.zig b/lib/std/build.zig
index fce3a0bce..181107327 100644
--- a/lib/std/build.zig
+++ b/lib/std/build.zig
@@ -195,7 +195,8 @@ pub const Builder = struct {
             self.install_prefix = install_prefix orelse "/usr";
             self.install_path = fs.path.join(self.allocator, &[_][]const u8{ dest_dir, self.install_prefix }) catch unreachable;
         } else {
-            self.install_prefix = install_prefix orelse self.cache_root;
+            self.install_prefix = install_prefix orelse
+                (fs.path.join(self.allocator, &[_][]const u8{ self.build_root, "zig-out" }) catch unreachable);
             self.install_path = self.install_prefix;
         }
         self.lib_dir = fs.path.join(self.allocator, &[_][]const u8{ self.install_path, "lib" }) catch unreachable;