diff --git a/src/feature-projected-line.h b/src/feature-projected-line.h
index f83dfa55d59f0f25506271667a4b0f999d1d0fd7..1228f6b6c2a3315648827369ac5339f764da28c3 100644
--- a/src/feature-projected-line.h
+++ b/src/feature-projected-line.h
@@ -36,7 +36,7 @@
 /* --------------------------------------------------------------------- */
 
 #if defined (WIN32)
-#  if defined (feature_projectedLine_EXPORTS)
+#  if defined (feature_projected_line_EXPORTS)
 #    define SOTFEATUREPROJECTEDLINE_EXPORT __declspec(dllexport)
 #  else
 #    define SOTFEATUREPROJECTEDLINE_EXPORT __declspec(dllimport)