diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 644bf9b8..613c54cf 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -3,6 +3,7 @@
 
 #include <stdarg.h>
 #include <stddef.h>
+#include <sys/stat.h>
 
 #define SEEK_SET 0
 #define SEEK_CUR 1
@@ -29,7 +30,7 @@ extern "C"
     FILE *fopen(const char *filename, const char *mode);
     size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
     size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
-    int fseek(FILE *stream, long offset, int whence);
+    off_t fseek(FILE *stream, long offset, int whence);
     long ftell(FILE *stream);
     int fclose(FILE *fp);
     int fflush(FILE *stream);
diff --git a/libc/include/sys/stat.h b/libc/include/sys/stat.h
index 80471f25..6dbd35c9 100644
--- a/libc/include/sys/stat.h
+++ b/libc/include/sys/stat.h
@@ -4,7 +4,7 @@
 typedef unsigned int _dev_t;
 typedef unsigned short _ino_t;
 typedef unsigned short _mode_t;
-typedef int _off_t;
+typedef long _off_t;
 
 #define dev_t _dev_t
 #define ino_t _ino_t
diff --git a/libc/src/std/io/file.c b/libc/src/std/io/file.c
index fb5478c2..4706ba5f 100644
--- a/libc/src/std/io/file.c
+++ b/libc/src/std/io/file.c
@@ -35,22 +35,13 @@ int fclose(FILE *fp)
     return syscall1(_FileClose, (uint64_t)KP);
 }
 
-int fseek(FILE *stream, long offset, int whence)
+off_t fseek(FILE *stream, long offset, int whence)
 {
-    switch (whence)
-    {
-    case SEEK_SET:
-        stream->offset = offset;
-        break;
-    case SEEK_CUR:
-        break;
-    case SEEK_END:
-        // stream->offset = syscall1(_FileLength, (uint64_t)File->KernelPrivate) + offset;
-        break;
-    default:
+    off_t new_offset = syscall3(_FileSeek, stream->KernelPrivate, offset, whence);
+    if (IsSyscallError(new_offset))
         return -1;
-    }
-    return stream->offset;
+    stream->offset = new_offset;
+    return new_offset;
 }
 
 long ftell(FILE *stream)