diff --git a/numpy/core/include/numpy/npy_common.h b/numpy/core/include/numpy/npy_common.h
index 88794ca07e36..1d6234e20e0f 100644
--- a/numpy/core/include/numpy/npy_common.h
+++ b/numpy/core/include/numpy/npy_common.h
@@ -180,12 +180,6 @@
     defined(__MINGW32__) || defined(__MINGW64__)
     #include <io.h>
 
-/* mingw based on 3.4.5 has lseek but not ftell/fseek */
-#if defined(__MINGW32__) || defined(__MINGW64__)
-extern int __cdecl _fseeki64(FILE *, long long, int);
-extern long long __cdecl _ftelli64(FILE *);
-#endif
-
     #define npy_fseek _fseeki64
     #define npy_ftell _ftelli64
     #define npy_lseek _lseeki64