diff --git a/src/ccutil/tesserrstream.h b/src/ccutil/tesserrstream.h
index 3452f35e99..80da99da0e 100644
--- a/src/ccutil/tesserrstream.h
+++ b/src/ccutil/tesserrstream.h
@@ -17,6 +17,7 @@
 #define TESSERACT_CCUTIL_TESSERRSTREAM_H
 
 #include "tprintf.h"
+#include <tesseract/export.h> // for TESS_API
 
 #include <ostream> // for std::ostream
 
@@ -60,7 +61,7 @@ class TessErrStream : public std::ostream {
   }
 };
 
-extern TessErrStream tesserr;
+extern TESS_API TessErrStream tesserr;
 
 } // namespace tesseract