diff --git a/mrbgems/mruby-task/mrbgem.rake b/mrbgems/mruby-task/mrbgem.rake
index 1a7085be1..8c9189878 100644
--- a/mrbgems/mruby-task/mrbgem.rake
+++ b/mrbgems/mruby-task/mrbgem.rake
@@ -6,5 +6,10 @@ MRuby::Gem::Specification.new('mruby-task') do |spec|
   # Enable task scheduler globally (required for vm.c integration)
   spec.build.defines << 'MRB_USE_TASK_SCHEDULER'
 
+  # Windows: link with multimedia timer library
+  if spec.for_windows?
+    spec.linker.libraries << 'winmm'
+  end
+
   spec.add_dependency 'mruby-fiber'  # Uses same context infrastructure
 end