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-rw-r--r--src/H5win32defs.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/H5win32defs.h b/src/H5win32defs.h
index 030b65b..44cf50c 100644
--- a/src/H5win32defs.h
+++ b/src/H5win32defs.h
@@ -80,7 +80,7 @@ struct timezone {
#define HDstrtok_r(X, Y, Z) strtok_s(X, Y, Z)
#define HDtzset() _tzset()
#define HDunlink(S) _unlink(S)
-#define HDunsetenv(N, V, O) Wsetenv(N, "", 1)
+#define HDunsetenv(N) Wsetenv(N, "", 1)
#define HDwrite(F, M, Z) _write(F, M, Z)
#ifndef H5_HAVE_MINGW