diff --git a/lib/posix/options/Kconfig.profile b/lib/posix/options/Kconfig.profile
index 4f97786b0d57..2eb0c9a11ce0 100644
--- a/lib/posix/options/Kconfig.profile
+++ b/lib/posix/options/Kconfig.profile
@@ -11,7 +11,6 @@ config POSIX_API
 	select POSIX_NETWORKING if NETWORKING # inet_ntoa(), socket(), etc
 	imply EVENTFD # eventfd(), eventfd_read(), eventfd_write()
 	imply POSIX_FD_MGMT # open(), close(), read(), write()
-	imply POSIX_MESSAGE_PASSING # mq_open(), etc
 	imply POSIX_MULTI_PROCESS # sleep(), getpid(), etc
 	help
 	  This option enables the required POSIX System Interfaces (base definitions), all of PSE51,
diff --git a/lib/posix/options/Kconfig.pthread b/lib/posix/options/Kconfig.pthread
index 4eef794039a3..438506fe2182 100644
--- a/lib/posix/options/Kconfig.pthread
+++ b/lib/posix/options/Kconfig.pthread
@@ -15,6 +15,9 @@ menuconfig POSIX_THREADS
 
 if POSIX_THREADS
 
+config HEAP_MEM_POOL_ADD_SIZE_POSIX_THREADS
+	def_int 256
+
 config POSIX_THREAD_THREADS_MAX
 	int "Maximum number of POSIX threads"
 	default 5