diff --git a/include/isam.cpp b/include/isam.cpp
index 209836c04..0a567e853 100755
--- a/include/isam.cpp
+++ b/include/isam.cpp
@@ -1566,7 +1566,7 @@ TIsamtempfile::TIsamtempfile(int logicnum, const char* radix, bool create)
     FILE* f = fopen(n, "r");
 
 #if XVT_OS == XVT_OS_WIN || XVT_OS == XVT_OS_NT
-    CHECKS(f, "Can't open temporary file ", (const char*)strerror(NULL));
+    CHECKS(f, "Can't open temporary file ", (const char*)_strerror(NULL));
 #else    
     CHECKS(f, "Can't open temporary file ", (const char*)n);
 #endif