1 files changed, 2 insertions, 0 deletions
diff --git a/src/io.cpp b/src/io.cpp
index 72bae3db..b274897f 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -1,4 +1,6 @@
 // Utilities for io redirection.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <stddef.h>