diff --git a/boards/sim/sim/sim/scripts/Make.defs b/boards/sim/sim/sim/scripts/Make.defs
index 179da7596d9..d374c9092f6 100644
--- a/boards/sim/sim/sim/scripts/Make.defs
+++ b/boards/sim/sim/sim/scripts/Make.defs
@@ -41,6 +41,16 @@ ARCHPICFLAGS = -fpic
 ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
 ARCHWARNINGSXX = -Wall -Wshadow -Wundef
 
+# Add -fvisibility=hidden
+# Because we don't want export nuttx's symbols to share libraries
+
+ARCHCPUFLAGS += -fvisibility=hidden
+ARCHCPUFLAGSXX += -fvisibility=hidden
+
+ifeq ($(CONFIG_HOST_MACOS),y)
+  LDLINKFLAGS += -keep_private_externs
+endif
+
 # Add -fno-common because macOS "ld -r" doesn't seem to pick objects
 # for common symbols.
 ARCHCPUFLAGS += -fno-common