diff --git a/src/rand.c b/src/rand.c
index 061e85e..c696944 100644
--- a/src/rand.c
+++ b/src/rand.c
@@ -23,6 +23,10 @@
 #include <string.h> /* memeset */
 #include <time.h>   /* clock, time */
 
+#if !defined(_WIN32)
+#include <unistd.h>
+#endif
+
 #if !defined(DONT_USE_GETRANDOM) && defined(__linux__) && \
     defined(__GLIBC_PREREQ)
 #if __GLIBC_PREREQ(2, 25)
diff --git a/src/tls.c b/src/tls.c
index 17d85dd..a6e75a5 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -21,6 +21,10 @@
 #include <stdarg.h>
 #include <string.h>
 
+#if !defined(_WIN32)
+#include <unistd.h>
+#endif
+
 #include "strophe.h"
 
 #include "common.h"