diff --git a/qemu-common.h b/qemu-common.h
index ac9985c..3a5616c 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -55,6 +55,9 @@ typedef struct MigrationParams MigrationParams;
 #ifndef O_BINARY
 #define O_BINARY 0
 #endif
+#ifndef O_NONBLOCK
+#define O_NONBLOCK 0
+#endif
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif