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--- a/src/mk/FreeBSD
+++ b/src/mk/FreeBSD
@@ -4,5 +4,6 @@
 ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) \
 	 -pthread  \
 	 -DHAVE_VASPRINTF=1 \
-	 -DHAVE_MKDTEMP=1
+	 -DHAVE_MKDTEMP=1 \
+	 -DSTATFS_INCLUDE="<sys/mount.h>"
 LIBSYS =