diff --git a/core/deps/picotcp/include/arch/pico_posix.h b/core/deps/picotcp/include/arch/pico_posix.h
index 427fed8f0..bb1da6c25 100644
--- a/core/deps/picotcp/include/arch/pico_posix.h
+++ b/core/deps/picotcp/include/arch/pico_posix.h
@@ -8,7 +8,9 @@
 
 #include <string.h>
 #include <stdio.h>
+#ifndef _MSC_VER
 #include <unistd.h>
+#endif
 #include <sys/time.h>
 
 /*
@@ -130,7 +132,7 @@ extern void *pico_thread_create(void *(*routine)(void *), void *arg);
 
 static inline void PICO_IDLE(void)
 {
-    usleep(5000);
+    // Not used anyway usleep(5000);
 }
 
 #endif  /* PICO_SUPPORT_POSIX */
diff --git a/core/deps/picotcp/include/pico_defines_msvc.h b/core/deps/picotcp/include/pico_defines_msvc.h
index dbe4513e3..3cc633b9d 100644
--- a/core/deps/picotcp/include/pico_defines_msvc.h
+++ b/core/deps/picotcp/include/pico_defines_msvc.h
@@ -11,4 +11,6 @@
 #define PICO_SUPPORT_DNS_CLIENT
 #define PICO_SUPPORT_CRC
 #define PICO_SUPPORT_PPP
+
+#define inline __inline
 #endif