diff --git a/src/gts.h b/src/gts.h
index 1b7691531..1e87167bc 100644
--- a/src/gts.h
+++ b/src/gts.h
@@ -40,7 +40,7 @@ extern "C" {
  */
 #if 1
 #  ifdef GTS_COMPILATION
-#    define GTS_C_VAR __declspec(dllexport)
+#    define GTS_C_VAR extern __declspec(dllexport)
 #  else /* not GTS_COMPILATION */
 #    define GTS_C_VAR extern __declspec(dllimport)
 #  endif /* not GTS_COMPILATION */