diff --git a/src/tool_getpass.c b/src/tool_getpass.c
index 34e0e6f5b5eda864d4a2747a6c188908b4fd2979..4036d7ed3ae373bd36a6c3034a4614331c68e63c 100644
--- a/src/tool_getpass.c
+++ b/src/tool_getpass.c
@@ -52,7 +52,9 @@
 #  endif
 #endif
 
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #define _MPRINTF_REPLACE
 #include <curl/mprintf.h>