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-rw-r--r--include/unistd.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/unistd.h b/include/unistd.h
index 37671fa4..9287338c 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -13,7 +13,7 @@ extern "C" {
 #define SEEK_CUR 1
 #define SEEK_END 2
 
-#if defined(_BSD_SOURCE)
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define L_SET 0
 #define L_INCR 1
 #define L_XTND 2