diff --git a/lib/posix/shell/CMakeLists.txt b/lib/posix/shell/CMakeLists.txt
index 89510836558..2d809f5b74f 100644
--- a/lib/posix/shell/CMakeLists.txt
+++ b/lib/posix/shell/CMakeLists.txt
@@ -1,6 +1,12 @@
 # Copyright (c) 2024 Meta
 # SPDX-License-Identifier: Apache-2.0
 
+zephyr_library()
+# For setenv() and unsetenv()
+zephyr_library_compile_options(-U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L)
+# For getenv_r() visibility
+zephyr_library_compile_definitions(_BSD_SOURCE)
+
 zephyr_library_sources_ifdef(CONFIG_POSIX_SHELL posix_shell.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_UNAME_SHELL uname.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_ENV_SHELL env.c)