diff --git a/io/GeotiffSupport.cpp b/io/GeotiffSupport.cpp
index 7b75818..909992d 100644
--- a/io/GeotiffSupport.cpp
+++ b/io/GeotiffSupport.cpp
@@ -43,8 +43,8 @@ PDAL_C_START
 
 // These functions are available from GDAL, but they
 // aren't exported.
-char CPL_DLL * GTIFGetOGISDefn(GTIF*, GTIFDefn*);
-int CPL_DLL GTIFSetFromOGISDefn(GTIF*, const char*);
+char GTIF_DLL * GTIFGetOGISDefn(GTIF*, GTIFDefn*);
+int GTIF_DLL GTIFSetFromOGISDefn(GTIF*, const char*);
 
 PDAL_C_END