diff --git a/build/vs2008/config-win32.h.in b/build/vs2008/config-win32.h.in
index 1a6663ec..f98c4b05 100644
--- a/build/vs2008/config-win32.h.in
+++ b/build/vs2008/config-win32.h.in
@@ -153,15 +153,6 @@
 /* Define to the version of this package. */
 #define PACKAGE_VERSION "@GMIME_VERSION@"
 
-/* The size of `off_t', as computed by sizeof. */
-#define SIZEOF_OFF_T 4
-
-/* The size of `size_t', as computed by sizeof. */
-#define SIZEOF_SIZE_T 4
-
-/* The size of `ssize_t', as computed by sizeof. */
-#define SIZEOF_SSIZE_T 4
-
 /* Define to 1 if you have the ANSI C header files. */
 #define STDC_HEADERS 1
 
diff --git a/build/vs2010/config-win32.h.in b/build/vs2010/config-win32.h.in
index 1a6663ec..f98c4b05 100644
--- a/build/vs2010/config-win32.h.in
+++ b/build/vs2010/config-win32.h.in
@@ -153,15 +153,6 @@
 /* Define to the version of this package. */
 #define PACKAGE_VERSION "@GMIME_VERSION@"
 
-/* The size of `off_t', as computed by sizeof. */
-#define SIZEOF_OFF_T 4
-
-/* The size of `size_t', as computed by sizeof. */
-#define SIZEOF_SIZE_T 4
-
-/* The size of `ssize_t', as computed by sizeof. */
-#define SIZEOF_SSIZE_T 4
-
 /* Define to 1 if you have the ANSI C header files. */
 #define STDC_HEADERS 1
 
diff --git a/configure.ac b/configure.ac
index 8fd9e2a9..82ab9289 100644
--- a/configure.ac
+++ b/configure.ac
@@ -440,15 +440,6 @@ else
 fi
 AM_CONDITIONAL(ENABLE_LARGEFILE, test "x$enable_largefile" = "xyes")
 
-dnl Check type sizes
-CFLAGS_save="$CFLAGS"
-CFLAGS="$CFLAGS $LFS_CFLAGS"
-AC_CHECK_SIZEOF(ssize_t)
-AC_CHECK_SIZEOF(size_t)
-AC_CHECK_SIZEOF(off_t)
-AC_CHECK_SIZEOF(time_t)
-CFLAGS="$CFLAGS_save"
-
 dnl Check for some network functions
 AC_CHECK_FUNCS(gethostname getdomainname getaddrinfo)