diff --git a/libc/include/sys/vfs.h b/libc/include/sys/vfs.h
index 6fce3b4..79995bb 100644
--- a/libc/include/sys/vfs.h
+++ b/libc/include/sys/vfs.h
@@ -37,37 +37,53 @@
 /* The kernel's __kernel_fsid_t has a 'val' member but glibc uses '__val'. */
 typedef struct { int __val[2]; } __fsid_t;
 
-/* Our struct statfs corresponds to the kernel's statfs64 type. */
-#ifdef __mips__
+#if defined(__LP64__)
 struct statfs {
-    uint32_t f_type;
-    uint32_t f_bsize;
-    uint32_t f_frsize;
-    uint32_t __pad;
-    uint64_t f_blocks;
-    uint64_t f_bfree;
-    uint64_t f_files;
-    uint64_t f_ffree;
-    uint64_t f_bavail;
-    __fsid_t f_fsid;
-    uint32_t f_namelen;
-    uint32_t f_flags;
-    uint32_t f_spare[5];
+  uint64_t f_type;
+  uint64_t f_bsize;
+  uint64_t f_blocks;
+  uint64_t f_bfree;
+  uint64_t f_bavail;
+  uint64_t f_files;
+  uint64_t f_ffree;
+  __fsid_t f_fsid;
+  uint64_t f_namelen;
+  uint64_t f_frsize;
+  uint64_t f_flags;
+  uint64_t f_spare[4];
+};
+#elif defined(__mips__)
+/* 32-bit MIPS (corresponds to the kernel's statfs64 type). */
+struct statfs {
+  uint32_t f_type;
+  uint32_t f_bsize;
+  uint32_t f_frsize;
+  uint32_t __pad;
+  uint64_t f_blocks;
+  uint64_t f_bfree;
+  uint64_t f_files;
+  uint64_t f_ffree;
+  uint64_t f_bavail;
+  __fsid_t f_fsid;
+  uint32_t f_namelen;
+  uint32_t f_flags;
+  uint32_t f_spare[5];
 };
 #else
+/* 32-bit ARM or x86 (corresponds to the kernel's statfs64 type). */
 struct statfs {
-    uint32_t f_type;
-    uint32_t f_bsize;
-    uint64_t f_blocks;
-    uint64_t f_bfree;
-    uint64_t f_bavail;
-    uint64_t f_files;
-    uint64_t f_ffree;
-    __fsid_t f_fsid;
-    uint32_t f_namelen;
-    uint32_t f_frsize;
-    uint32_t f_flags;
-    uint32_t f_spare[4];
+  uint32_t f_type;
+  uint32_t f_bsize;
+  uint64_t f_blocks;
+  uint64_t f_bfree;
+  uint64_t f_bavail;
+  uint64_t f_files;
+  uint64_t f_ffree;
+  __fsid_t f_fsid;
+  uint32_t f_namelen;
+  uint32_t f_frsize;
+  uint32_t f_flags;
+  uint32_t f_spare[4];
 };
 #endif