diff --git a/src/tiff/libtiff/tif_unix.c b/src/tiff/libtiff/tif_unix.c
index 1db40cdfd0..5ae1934103 100644
--- a/src/tiff/libtiff/tif_unix.c
+++ b/src/tiff/libtiff/tif_unix.c
@@ -54,6 +54,12 @@
 
 #include "tiffiop.h"
 
+typedef union fd_as_handle_union
+{
+	int fd;
+	thandle_t h;
+} fd_as_handle_union_t;
+
 static tmsize_t
 _tiffReadProc(thandle_t fd, void* buf, tmsize_t size)
 {
diff --git a/src/tiff/libtiff/tif_win32.c b/src/tiff/libtiff/tif_win32.c
index 58c08103ce..b64dd8d5cf 100644
--- a/src/tiff/libtiff/tif_win32.c
+++ b/src/tiff/libtiff/tif_win32.c
@@ -209,9 +209,7 @@ TIFFFdOpen(int ifd, const char* name, const char* mode)
 	TIFF* tif;
 	int fSuppressMap;
 	int m;
-	fd_as_handle_union_t fdh;
 	fSuppressMap=0;
-	fdh.fd = ifd;
 	for (m=0; mode[m]!=0; m++)
 	{
 		if (mode[m]=='u')
@@ -220,7 +218,7 @@ TIFFFdOpen(int ifd, const char* name, const char* mode)
 			break;
 		}
 	}
-	tif = TIFFClientOpen(name, mode, fdh.h,
+	tif = TIFFClientOpen(name, mode, (thandle_t)ifd,
 			_tiffReadProc, _tiffWriteProc,
 			_tiffSeekProc, _tiffCloseProc, _tiffSizeProc,
 			fSuppressMap ? _tiffDummyMapProc : _tiffMapProc,
@@ -239,7 +237,7 @@ TIFF*
 TIFFOpen(const char* name, const char* mode)
 {
 	static const char module[] = "TIFFOpen";
-	fd_as_handle_union_t fdh;
+	thandle_t fd;
 	int m;
 	DWORD dwMode;
 	TIFF* tif;
@@ -255,19 +253,19 @@ TIFFOpen(const char* name, const char* mode)
 		default:			return ((TIFF*)0);
 	}
 
-	fdh.h = CreateFileA(name,
+	fd = (thandle_t)CreateFileA(name,
 		(m == O_RDONLY)?GENERIC_READ:(GENERIC_READ | GENERIC_WRITE),
 		FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, dwMode,
 		(m == O_RDONLY)?FILE_ATTRIBUTE_READONLY:FILE_ATTRIBUTE_NORMAL,
 		NULL);
-	if (fdh.h == INVALID_HANDLE_VALUE) {
+	if (fd == INVALID_HANDLE_VALUE) {
 		TIFFErrorExt(0, module, "%s: Cannot open", name);
 		return ((TIFF *)0);
 	}
 
-	tif = TIFFFdOpen(fdh.fd, name, mode);
+	tif = TIFFFdOpen((int)fd, name, mode);
 	if(!tif)
-		CloseHandle(fdh.h);
+		CloseHandle(fd);
 	return tif;
 }
 
@@ -278,7 +276,7 @@ TIFF*
 TIFFOpenW(const wchar_t* name, const char* mode)
 {
 	static const char module[] = "TIFFOpenW";
-	fd_as_handle_union_t fdh;
+	thandle_t fd;
 	int m;
 	DWORD dwMode;
 	int mbsize;
@@ -296,12 +294,12 @@ TIFFOpenW(const wchar_t* name, const char* mode)
 		default:			return ((TIFF*)0);
 	}
 
-	fdh.h = CreateFileW(name,
+	fd = (thandle_t)CreateFileW(name,
 		(m == O_RDONLY)?GENERIC_READ:(GENERIC_READ|GENERIC_WRITE),
 		FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, dwMode,
 		(m == O_RDONLY)?FILE_ATTRIBUTE_READONLY:FILE_ATTRIBUTE_NORMAL,
 		NULL);
-	if (fdh.h == INVALID_HANDLE_VALUE) {
+	if (fd == INVALID_HANDLE_VALUE) {
 		TIFFErrorExt(0, module, "%S: Cannot open", name);
 		return ((TIFF *)0);
 	}
@@ -320,10 +318,10 @@ TIFFOpenW(const wchar_t* name, const char* mode)
 				    NULL, NULL);
 	}
 
-	tif = TIFFFdOpen(fdh.fd,
+	tif = TIFFFdOpen((int)fd,
 			 (mbname != NULL) ? mbname : "<unknown>", mode);
 	if(!tif)
-		CloseHandle(fdh.h);
+		CloseHandle(fd);
 
 	_TIFFfree(mbname);
 
diff --git a/src/tiff/libtiff/tiffiop.h b/src/tiff/libtiff/tiffiop.h
index 748ed4598a..3d9551a80b 100644
--- a/src/tiff/libtiff/tiffiop.h
+++ b/src/tiff/libtiff/tiffiop.h
@@ -77,17 +77,6 @@ typedef struct client_info {
     char *name;
 } TIFFClientInfoLink;
 
-/*
- * Union allowing to cast between the OS-specific handles and integer file
- * descriptors without triggering compiler warnings, even if their types are
- * not the same.
- */
-typedef union fd_as_handle_union
-{
-    int fd;
-    thandle_t h;
-} fd_as_handle_union_t;
-
 /*
  * Typedefs for ``method pointers'' used internally.
  * these are depriciated and provided only for backwards compatibility