diff --git a/lib/minizip/ioapi.c b/lib/minizip/ioapi.c
index 14cf9aae2..a22dca8c4 100644
--- a/lib/minizip/ioapi.c
+++ b/lib/minizip/ioapi.c
@@ -221,7 +221,7 @@ static int ZCALLBACK ferror_file_func (voidpf opaque, voidpf stream)
     return ret;
 }
 
-void fill_fopen_filefunc (pzlib_filefunc_def)
+ZEXPORT void fill_fopen_filefunc(pzlib_filefunc_def)
   zlib_filefunc_def* pzlib_filefunc_def;
 {
     pzlib_filefunc_def->zopen_file = fopen_file_func;
@@ -234,7 +234,7 @@ void fill_fopen_filefunc (pzlib_filefunc_def)
     pzlib_filefunc_def->opaque = NULL;
 }
 
-void fill_fopen64_filefunc(zlib_filefunc64_def*  pzlib_filefunc_def)
+ZEXPORT void fill_fopen64_filefunc(zlib_filefunc64_def*  pzlib_filefunc_def)
 {
     pzlib_filefunc_def->zopen64_file = fopen64_file_func;
     pzlib_filefunc_def->zread_file = fread_file_func;