diff --git a/OpenEXR/IlmImf/ImfCRgbaFile.h b/OpenEXR/IlmImf/ImfCRgbaFile.h
index e70ffa6e1b..a1ce8328e3 100644
--- a/OpenEXR/IlmImf/ImfCRgbaFile.h
+++ b/OpenEXR/IlmImf/ImfCRgbaFile.h
@@ -443,6 +443,7 @@ int	       	ImfTiledOutputLevelRoundingMode
 struct ImfInputFile;
 typedef struct ImfInputFile ImfInputFile;
 
+IMF_EXPORT
 ImfInputFile *		ImfOpenInputFile (const char name[]);
 
 IMF_EXPORT