diff --git a/gzlib.c b/gzlib.c
index b99c26c..e31533b 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -185,12 +185,13 @@ local gzFile gz_open(path, fd, mode)
     }
 
     /* save the path name for error messages */
-    state->path = malloc(strlen(path) + 1);
+#   define WPATH "<widepath>"
+    state->path = malloc(strlen(fd == -2 ? WPATH : (path) + 1);
     if (state->path == NULL) {
         free(state);
         return NULL;
     }
-    strcpy(state->path, path);
+    strcpy(state->path, fd == -2 ? WPATH : path);
 
     /* compute the flags for open() */
     oflag =
diff --git a/zconf.h b/zconf.h
index f9a5fa7..8c6f945 100644
--- a/zconf.h
+++ b/zconf.h
@@ -402,6 +402,10 @@ typedef uLong FAR uLongf;
 #  endif
 #endif
 
+#ifdef _WIN32
+#  include <stddef.h>           /* for wchar_t */
+#endif
+
 /* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
  * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
  * though the former does not conform to the LFS document), but considering
diff --git a/zconf.h.cmakein b/zconf.h.cmakein
index 66368ad..4ade487 100644
--- a/zconf.h.cmakein
+++ b/zconf.h.cmakein
@@ -404,6 +404,10 @@ typedef uLong FAR uLongf;
 #  endif
 #endif
 
+#ifdef _WIN32
+#  include <stddef.h>           /* for wchar_t */
+#endif
+
 /* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
  * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
  * though the former does not conform to the LFS document), but considering
diff --git a/zconf.h.in b/zconf.h.in
index f9a5fa7..8c6f945 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -402,6 +402,10 @@ typedef uLong FAR uLongf;
 #  endif
 #endif
 
+#ifdef _WIN32
+#  include <stddef.h>           /* for wchar_t */
+#endif
+
 /* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
  * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
  * though the former does not conform to the LFS document), but considering