diff --git a/src/Compilation.zig b/src/Compilation.zig
index 353a2f1ca3..32d06e5907 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -2516,6 +2516,7 @@ fn addNonIncrementalStuffToCacheManifest(comp: *Compilation, man: *Cache.Manifes
     man.hash.addOptionalBytes(comp.bin_file.options.soname);
     man.hash.addOptional(comp.bin_file.options.version);
     link.hashAddSystemLibs(&man.hash, comp.bin_file.options.system_libs);
+    man.hash.addListOfBytes(comp.bin_file.options.force_undefined_symbols.keys());
     man.hash.addOptional(comp.bin_file.options.allow_shlib_undefined);
     man.hash.add(comp.bin_file.options.bind_global_refs_locally);
     man.hash.add(comp.bin_file.options.tsan);
diff --git a/src/link/Coff.zig b/src/link/Coff.zig
index c30544d3b7..e4f0227aec 100644
--- a/src/link/Coff.zig
+++ b/src/link/Coff.zig
@@ -1032,6 +1032,7 @@ fn linkWithLLD(self: *Coff, comp: *Compilation, prog_node: *std.Progress.Node) !
             }
         }
         link.hashAddSystemLibs(&man.hash, self.base.options.system_libs);
+        man.hash.addListOfBytes(self.base.options.force_undefined_symbols.keys());
         man.hash.addOptional(self.base.options.subsystem);
         man.hash.add(self.base.options.is_test);
         man.hash.add(self.base.options.tsaware);
diff --git a/src/link/Elf.zig b/src/link/Elf.zig
index 293771dd2a..e63fa07187 100644
--- a/src/link/Elf.zig
+++ b/src/link/Elf.zig
@@ -1349,6 +1349,7 @@ fn linkWithLLD(self: *Elf, comp: *Compilation, prog_node: *std.Progress.Node) !v
         man.hash.addOptionalBytes(self.base.options.soname);
         man.hash.addOptional(self.base.options.version);
         link.hashAddSystemLibs(&man.hash, self.base.options.system_libs);
+        man.hash.addListOfBytes(self.base.options.force_undefined_symbols.keys());
         man.hash.add(allow_shlib_undefined);
         man.hash.add(self.base.options.bind_global_refs_locally);
         man.hash.add(self.base.options.compress_debug_sections);