diff --git a/examples/client.c b/examples/client.c
index 9ffd5ea6..6ce1fd56 100644
--- a/examples/client.c
+++ b/examples/client.c
@@ -17,6 +17,9 @@
 #ifdef _WIN32
 #define strcasecmp _stricmp
 #include "getopt.c"
+#if !defined(S_ISDIR)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
 #else
 #include <unistd.h>
 #include <sys/select.h>
diff --git a/examples/coap-server.c b/examples/coap-server.c
index a3bb4bda..d58f6347 100644
--- a/examples/coap-server.c
+++ b/examples/coap-server.c
@@ -20,6 +20,9 @@
 #ifdef _WIN32
 #define strcasecmp _stricmp
 #include "getopt.c"
+#if !defined(S_ISDIR)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
 #else
 #include <unistd.h>
 #include <sys/select.h>