diff --git a/source/dub/commandline.d b/source/dub/commandline.d
index 93981f6..fe6bb5c 100644
--- a/source/dub/commandline.d
+++ b/source/dub/commandline.d
@@ -521,6 +521,8 @@
 		static string input(string caption, string default_value)
 		{
 			writef("%s [%s]: ", caption, default_value);
+			// Msys2 and mingw on Windows require this flush()
+			version (Windows) stdout.flush();
 			auto inp = readln();
 			return inp.length > 1 ? inp[0 .. $-1] : default_value;
 		}