1 files changed, 1 insertions, 0 deletions
diff --git a/entropy.c b/entropy.c
index f0331a84..c89e0b52 100644
--- a/entropy.c
+++ b/entropy.c
@@ -34,6 +34,7 @@
 #ifdef HAVE_FCNTL_H
 # include <fcntl.h>
 #endif
+#include <unistd.h>
 
 #include <openssl/rand.h>
 #include <openssl/crypto.h>