diff --git a/goo/TiffWriter.cc b/goo/TiffWriter.cc
index 98cbea5..65e99a1 100644
--- a/goo/TiffWriter.cc
+++ b/goo/TiffWriter.cc
@@ -164,12 +164,12 @@ bool TiffWriter::init(FILE *openedFile, int width, int height, int hDPI, int vDP
         return false;
     }
 
-#    ifdef _WIN32
-    // Convert C Library handle to Win32 Handle
-    priv->f = TIFFFdOpen(_get_osfhandle(fileno(openedFile)), "-", "w");
-#    else
-    priv->f = TIFFFdOpen(fileno(openedFile), "-", "w");
-#    endif
+    // conda-forge: our libtiff uses Unix FDs even on Windows. But
+    // we must be careful to dup() the FD, because otherwise we will
+    // cause crashes from closing a file handle twice on Windows:
+    // once in TIFFClose(), and once in the caller, which expects to
+    // have to fclose(openedFile) itself.
+    priv->f = TIFFFdOpen(dup(fileno(openedFile)), "-", "w");
 
     if (!priv->f) {
         return false;