diff --git a/include/zephyr/posix/stropts.h b/include/zephyr/posix/stropts.h
index 649f0d87b7a..41afdb5ae28 100644
--- a/include/zephyr/posix/stropts.h
+++ b/include/zephyr/posix/stropts.h
@@ -22,6 +22,7 @@ int fdetach(const char *path);
 int fattach(int fildes, const char *path);
 int getmsg(int fildes, struct strbuf *ctlptr, struct strbuf *dataptr, int *flagsp);
 int getpmsg(int fildes, struct strbuf *ctlptr, struct strbuf *dataptr, int *bandp, int *flagsp);
+int isastream(int fildes);
 
 #ifdef __cplusplus
 }
diff --git a/lib/posix/options/stropts.c b/lib/posix/options/stropts.c
index 66d44fcbb28..c1e6c9f54ed 100644
--- a/lib/posix/options/stropts.c
+++ b/lib/posix/options/stropts.c
@@ -58,3 +58,11 @@ int getpmsg(int fildes, struct strbuf *ctlptr, struct strbuf *dataptr, int *band
 	errno = ENOSYS;
 	return -1;
 }
+
+int isastream(int fildes)
+{
+	ARG_UNUSED(fildes);
+
+	errno = ENOSYS;
+	return -1;
+}