diff --git a/src/link/MachO.zig b/src/link/MachO.zig
index c2b8d02df5746e63cc90b96c1d28983be8825b38..71666beb074daf1d0cb9020324ed61e9134ef6e0 100644
--- a/src/link/MachO.zig
+++ b/src/link/MachO.zig
@@ -1290,7 +1290,7 @@ fn parseDependentDylibs(self: *MachO) !void {
                     }
                     try umbrella.rpaths.ensureUnusedCapacity(gpa, dep_dylib.rpaths.keys().len);
                     for (dep_dylib.rpaths.keys()) |rpath| {
-                        umbrella.rpaths.putAssumeCapacity(rpath, {});
+                        umbrella.rpaths.putAssumeCapacity(try gpa.dupe(u8, rpath), {});
                     }
                 }
             } else {