diff --git a/ext/dbm/dbm.gemspec b/ext/dbm/dbm.gemspec
index 9de425b521..02d4990ecb 100644
--- a/ext/dbm/dbm.gemspec
+++ b/ext/dbm/dbm.gemspec
@@ -17,4 +17,5 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "rake-compiler"
   s.add_development_dependency "test-unit"
+  s.metadata["msys2_mingw_dependencies"] = "gdbm"
 end