diff --git a/libc/config/gpu/api.td b/libc/config/gpu/api.td
index adaf5bfd747ac7..523ad49ffa3fd4 100644
--- a/libc/config/gpu/api.td
+++ b/libc/config/gpu/api.td
@@ -64,7 +64,11 @@ def StdIOAPI : PublicAPI<"stdio.h"> {
     SimpleMacroDef<"_IOLBF", "1">,
     SimpleMacroDef<"_IONBF", "2">,
   ];
-  let Types = ["size_t", "FILE"];
+  let Types = [
+    "FILE",
+    "off_t",
+    "size_t",
+  ];
 }
 
 def IntTypesAPI : PublicAPI<"inttypes.h"> {
diff --git a/libc/config/linux/api.td b/libc/config/linux/api.td
index eb5ed8089850e4..9964971f191b75 100644
--- a/libc/config/linux/api.td
+++ b/libc/config/linux/api.td
@@ -49,7 +49,10 @@ def CTypeAPI : PublicAPI<"ctype.h"> {
 }
 
 def FCntlAPI : PublicAPI<"fcntl.h"> {
-  let Types = ["mode_t"];
+  let Types = [
+    "mode_t",
+    "off_t",
+  ];
 }
 
 def IntTypesAPI : PublicAPI<"inttypes.h"> {
@@ -77,7 +80,12 @@ def StdIOAPI : PublicAPI<"stdio.h"> {
     SimpleMacroDef<"_IOLBF", "1">,
     SimpleMacroDef<"_IONBF", "2">,
   ];
-  let Types = ["size_t", "FILE", "cookie_io_functions_t"];
+  let Types = [
+    "FILE",
+    "cookie_io_functions_t",
+    "off_t",
+    "size_t",
+  ];
 }
 
 def StdlibAPI : PublicAPI<"stdlib.h"> {
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 4203f0bc901b22..02c7dc8fbc0b33 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -41,9 +41,10 @@ add_gen_header(
   DEF_FILE fcntl.h.def
   GEN_HDR fcntl.h
   DEPENDS
-    .llvm_libc_common_h
     .llvm-libc-macros.fcntl_macros
     .llvm-libc-types.mode_t
+    .llvm-libc-types.off_t
+    .llvm_libc_common_h
 )
 
 add_gen_header(
@@ -264,13 +265,14 @@ add_gen_header(
   DEF_FILE stdio.h.def
   GEN_HDR stdio.h
   DEPENDS
-    .llvm_libc_common_h
     .llvm-libc-macros.file_seek_macros
     .llvm-libc-macros.stdio_macros
-    .llvm-libc-types.size_t
-    .llvm-libc-types.ssize_t
     .llvm-libc-types.FILE
     .llvm-libc-types.cookie_io_functions_t
+    .llvm-libc-types.off_t
+    .llvm-libc-types.size_t
+    .llvm-libc-types.ssize_t
+    .llvm_libc_common_h
 )
 
 add_gen_header(
diff --git a/libc/spec/posix.td b/libc/spec/posix.td
index cfa8d3afedde3f..45f7ecfe84e98e 100644
--- a/libc/spec/posix.td
+++ b/libc/spec/posix.td
@@ -210,7 +210,10 @@ def POSIX : StandardSpec<"POSIX"> {
   HeaderSpec FCntl = HeaderSpec<
     "fcntl.h",
     [], // Macros
-    [ModeTType],
+    [
+        ModeTType,
+        OffTType,
+    ],
     [], // Enumerations
     [
       FunctionSpec<
@@ -1180,7 +1183,7 @@ def POSIX : StandardSpec<"POSIX"> {
   HeaderSpec StdIO = HeaderSpec<
       "stdio.h",
       [], // Macros
-      [], // Types
+      [OffTType], // Types
       [], // Enumerations
       [
           FunctionSpec<
diff --git a/libc/src/stdio/fseeko.h b/libc/src/stdio/fseeko.h
index 3202ed2f97d0ef..77fb41215c318f 100644
--- a/libc/src/stdio/fseeko.h
+++ b/libc/src/stdio/fseeko.h
@@ -10,7 +10,6 @@
 #define LLVM_LIBC_SRC_STDIO_FSEEKO_H
 
 #include <stdio.h>
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE {
 
diff --git a/libc/src/stdio/ftello.h b/libc/src/stdio/ftello.h
index 0fdf13ab6bdbcd..5ab17f9244a5ad 100644
--- a/libc/src/stdio/ftello.h
+++ b/libc/src/stdio/ftello.h
@@ -10,7 +10,6 @@
 #define LLVM_LIBC_SRC_STDIO_FTELLO_H
 
 #include <stdio.h>
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE {