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-rw-r--r--src/libutil/monitor-fd.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libutil/monitor-fd.hh b/src/libutil/monitor-fd.hh
index e99869effe1a..6f01ccd91a43 100644
--- a/src/libutil/monitor-fd.hh
+++ b/src/libutil/monitor-fd.hh
@@ -3,7 +3,7 @@
 #include <thread>
 #include <atomic>
 
-#include <stdlib.h>
+#include <cstdlib>
 #include <poll.h>
 #include <sys/types.h>
 #include <unistd.h>