diff --git a/bsp/stm32/stm32wb55-st-nucleo/rtconfig.h b/bsp/stm32/stm32wb55-st-nucleo/rtconfig.h
index ad99ee3ed8..c21b1c4357 100644
--- a/bsp/stm32/stm32wb55-st-nucleo/rtconfig.h
+++ b/bsp/stm32/stm32wb55-st-nucleo/rtconfig.h
@@ -90,7 +90,7 @@
 /* POSIX layer and C standard library */
 
 #define RT_USING_LIBC
-#define RT_USING_POSIX
+
 
 /* Network */