diff --git a/aom_util/aom_pthread.h b/aom_util/aom_pthread.h
index 827b9c2..1a97a0a 100644
--- a/aom_util/aom_pthread.h
+++ b/aom_util/aom_pthread.h
@@ -28,6 +28,7 @@
 #define NOMINMAX
 #undef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
+#include <errno.h>    // NOLINT
 #include <process.h>  // NOLINT
 #include <stddef.h>   // NOLINT
 #include <windows.h>  // NOLINT