diff --git a/lib/compat.h b/lib/compat.h
index 41b7ddb..91e72bb 100644
--- a/lib/compat.h
+++ b/lib/compat.h
@@ -77,6 +77,11 @@
 #define EOVERFLOW EFBIG
 #endif
 
+/* not supported on at least Windows */
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+
 #ifdef _WIN32
 #if defined(HAVE__CHMOD)
 #define chmod _chmod
@@ -191,4 +196,8 @@
 #define S_ISDIR(mode) (((mode)&S_IFMT) == S_IFDIR)
 #endif
 
+#ifndef S_ISREG
+#define S_ISREG(mode) (((mode)&S_IFMT) == S_IFREG)
+#endif
+
 #endif /* compat.h */
diff --git a/lib/zip_source_filep.c b/lib/zip_source_filep.c
index b2fc4b7..51b34f2 100644
--- a/lib/zip_source_filep.c
+++ b/lib/zip_source_filep.c
@@ -644,7 +644,8 @@
 	flags |= O_RDONLY;
     }
 
-    if ((fd = open(name, flags)) < 0) {
+    /* mode argument needed on Windows */
+    if ((fd = open(name, flags, 0666)) < 0) {
 	return NULL;
     }
     if ((fp = fdopen(fd, writeable ? "r+b" : "rb")) == NULL) {