diff --git a/kernel/include/sortix/__/types.h b/kernel/include/sortix/__/types.h
index d74d1487..dd2cb26a 100644
--- a/kernel/include/sortix/__/types.h
+++ b/kernel/include/sortix/__/types.h
@@ -42,9 +42,9 @@ typedef int __clockid_t;
 
 typedef __uintptr_t __dev_t;
 
-/* TODO: __fsblkcnt_t */
+typedef __intmax_t __fsblkcnt_t;
 
-/* TODO: __fsblksize_t */
+typedef __intmax_t __fsfilcnt_t;
 
 typedef __uint64_t __gid_t;
 
diff --git a/libc/include/sys/types.h b/libc/include/sys/types.h
index a23592ef..e9db425b 100644
--- a/libc/include/sys/types.h
+++ b/libc/include/sys/types.h
@@ -58,9 +58,15 @@ typedef __clockid_t clockid_t;
 typedef __dev_t dev_t;
 #endif
 
-/* TODO: fsblkcnt_t */
+#ifndef __fsblkcnt_t_defined
+#define __fsblkcnt_t_defined
+typedef __fsblkcnt_t fsblkcnt_t;
+#endif
 
-/* TODO: fsfilcnt_t */
+#ifndef __fsfilcnt_t_defined
+#define __fsfilcnt_t_defined
+typedef __fsfilcnt_t fsfilcnt_t;
+#endif
 
 #ifndef __gid_t_defined
 #define __gid_t_defined