1 files changed, 2 insertions, 0 deletions

diff --git a/tls/CMakeLists.txt b/tls/CMakeLists.txt
index 59deee3..4beef36 100644
--- a/tls/CMakeLists.txt
+++ b/tls/CMakeLists.txt
@@ -22,6 +22,8 @@ if(WIN32)
                 compat/pread.c
                 compat/pwrite.c
         )
+
+        set(LIBTLS_EXTRA_EXPORT ${LIBTLS_EXTRA_EXPORT} ftruncate)
 endif()
 
 if(NOT "${OPENSSLDIR}" STREQUAL "")