diff --git a/include/os/windows/spl/sys/types.h b/include/os/windows/spl/sys/types.h
index 40cb9b22a3a4..4edfbf88cc0c 100644
--- a/include/os/windows/spl/sys/types.h
+++ b/include/os/windows/spl/sys/types.h
@@ -156,6 +156,9 @@ typedef uintptr_t pc_t;
 #define	strtok_r strtok_s
 #define	strcasecmp _stricmp
 
+#define	srandom(x) srand(x)
+#define	random() rand()
+
 struct mount;
 typedef struct mount mount_t;
 
diff --git a/lib/libspl/include/os/windows/sys/types.h b/lib/libspl/include/os/windows/sys/types.h
index 48e68bb09726..9ac75b685980 100644
--- a/lib/libspl/include/os/windows/sys/types.h
+++ b/lib/libspl/include/os/windows/sys/types.h
@@ -190,6 +190,7 @@ int posix_memalign(void **memptr, size_t alignment, size_t size);
 #define	roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
 #define	howmany(x, y) ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1))
 
+#define	RLIMIT_CORE 4   /* core file size */
 #define	RLIMIT_NOFILE 8 /* number of open files */
 typedef uint64_t	rlim_t;
 struct rlimit {
@@ -205,6 +206,9 @@ struct rlimit {
 
 #define	strcasecmp _stricmp
 
+#define	srandom(x) srand(x)
+#define	random() rand()
+
 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
 
 #include <sys/isa_defs.h>