diff --git a/configs/sim/nx/defconfig b/configs/sim/nx/defconfig
index 8218088bb11..27c5baf60f7 100644
--- a/configs/sim/nx/defconfig
+++ b/configs/sim/nx/defconfig
@@ -123,9 +123,9 @@ CONFIG_DEV_LOWCONSOLE=n
 #
 CONFIG_DISABLE_CLOCK=n
 CONFIG_DISABLE_POSIX_TIMERS=y
-CONFIG_DISABLE_PTHREAD=y
+CONFIG_DISABLE_PTHREAD=n
 CONFIG_DISABLE_SIGNALS=n
-CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_MQUEUE=n
 CONFIG_DISABLE_MOUNTPOINT=y
 CONFIG_DISABLE_ENVIRON=y
 CONFIG_DISABLE_POLL=y
@@ -343,7 +343,7 @@ CONFIG_NXGLIB_DISABLE_32BPP=y
 CONFIG_NXGL_PACKEDMSFIRST=n
 CONFIG_NX_MOUSE=y
 CONFIG_NX_KBD=n
-CONFIG_NX_BLOCKING=n
+CONFIG_NX_BLOCKING=y
 CONFIG_NX_MXSERVERMSGS=32
 CONFIG_NX_MXCLIENTMSGS=16
 
diff --git a/configs/sim/nx/defconfig-x11 b/configs/sim/nx/defconfig-x11
index 5c95f8eabc7..397159148a7 100644
--- a/configs/sim/nx/defconfig-x11
+++ b/configs/sim/nx/defconfig-x11
@@ -123,9 +123,9 @@ CONFIG_DEV_LOWCONSOLE=n
 #
 CONFIG_DISABLE_CLOCK=n
 CONFIG_DISABLE_POSIX_TIMERS=y
-CONFIG_DISABLE_PTHREAD=y
+CONFIG_DISABLE_PTHREAD=n
 CONFIG_DISABLE_SIGNALS=n
-CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_MQUEUE=n
 CONFIG_DISABLE_MOUNTPOINT=y
 CONFIG_DISABLE_ENVIRON=y
 CONFIG_DISABLE_POLL=y
@@ -343,7 +343,7 @@ CONFIG_NXGLIB_DISABLE_32BPP=n
 CONFIG_NXGL_PACKEDMSFIRST=n
 CONFIG_NX_MOUSE=y
 CONFIG_NX_KBD=n
-CONFIG_NX_BLOCKING=n
+CONFIG_NX_BLOCKING=y
 CONFIG_NX_MXSERVERMSGS=32
 CONFIG_NX_MXCLIENTMSGS=16