diff --git a/src/runtime/c/pgf/db.cxx b/src/runtime/c/pgf/db.cxx
index cf9584c62..8463b6b6f 100644
--- a/src/runtime/c/pgf/db.cxx
+++ b/src/runtime/c/pgf/db.cxx
@@ -16,6 +16,9 @@
 
 #if defined(_MSC_VER)
 #include <io.h>
+#define open _open
+#define lseek _lseek
+#define close _close
 #endif
 
 #else