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-rw-r--r--extras/volume_id/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/extras/volume_id/Makefile b/extras/volume_id/Makefile
index 9c274212a6..efec58f80e 100644
--- a/extras/volume_id/Makefile
+++ b/extras/volume_id/Makefile
@@ -28,7 +28,7 @@ INSTALL_PROGRAM = ${INSTALL}
INSTALL_DATA = ${INSTALL} -m 644
INSTALL_SCRIPT = ${INSTALL_PROGRAM}
-override CFLAGS+=-D_FILE_OFFSET_BITS=64
+override CFLAGS+=-D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
VOLUME_ID_BASE=volume_id
include $(VOLUME_ID_BASE)/Makefile.inc