diff --git a/sys/sys/types.h b/sys/sys/types.h
index 51c02c8b553..6273f7cbfc0 100644
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -296,6 +296,36 @@ typedef	struct vm_page	*vm_page_t;
 
 #endif /* !_KERNEL */
 
+/*
+ * Solaris compatibility definitions.
+ */
+#ifdef _SOLARIS_C_SOURCE
+typedef u_int		uint_t;
+typedef u_char		uchar_t;
+typedef u_short		ushort_t;
+typedef u_long		ulong_t;
+
+typedef	long long	longlong_t;  
+typedef unsigned long long	u_longlong_t;
+
+typedef off_t		off64_t;
+
+typedef id_t		taskid_t;
+typedef id_t		projid_t;
+typedef id_t		poolid_t;
+typedef id_t		zoneid_t;
+typedef id_t		ctid_t;
+
+#ifndef _KERNEL
+#if defined(__XOPEN_OR_POSIX)
+typedef enum { _B_FALSE, _B_TRUE } boolean_t;
+#else
+typedef enum { B_FALSE, B_TRUE } boolean_t;
+#endif /* defined(__XOPEN_OR_POSIX) */
+#endif
+
+#endif /* _SOLARIS_C_SOURCE */
+
 /*
  * The following are all things that really shouldn't exist in this header,
  * since its purpose is to provide typedefs, not miscellaneous doodads.