diff --git a/test/run_input.cxx b/test/run_input.cxx
index 717c1da28..f86a1129b 100644
--- a/test/run_input.cxx
+++ b/test/run_input.cxx
@@ -18,6 +18,7 @@
 #include "fs/Path.hxx"
 #include "fs/NarrowPath.hxx"
 #include "io/BufferedOutputStream.hxx"
+#include "io/FileDescriptor.hxx"
 #include "io/StdioOutputStream.hxx"
 #include "cmdline/OptionDef.hxx"
 #include "cmdline/OptionParser.hxx"
diff --git a/test/run_output.cxx b/test/run_output.cxx
index e4358a84a..dad7c34e3 100644
--- a/test/run_output.cxx
+++ b/test/run_output.cxx
@@ -13,6 +13,7 @@
 #include "pcm/AudioFormat.hxx"
 #include "cmdline/OptionDef.hxx"
 #include "cmdline/OptionParser.hxx"
+#include "io/FileDescriptor.hxx"
 #include "util/StringBuffer.hxx"
 #include "util/ScopeExit.hxx"
 #include "util/StaticFifoBuffer.hxx"