diff --git a/apps/CMakeLists.txt b/apps/CMakeLists.txt
index 8f0cdef2..4ab52d3b 100644
--- a/apps/CMakeLists.txt
+++ b/apps/CMakeLists.txt
@@ -1,5 +1,6 @@
 function(luna_app SOURCE_FILE APP_NAME)
     add_executable(${APP_NAME} ${SOURCE_FILE})
+    target_compile_options(${APP_NAME} PRIVATE -Os -Wall -Wextra -pedantic -Werror)
     add_dependencies(${APP_NAME} libc)
     target_include_directories(${APP_NAME} PRIVATE ${LUNA_BASE}/usr/include)
     install(TARGETS ${APP_NAME} DESTINATION ${LUNA_ROOT}/initrd/bin)
diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index 270ecf41..b731ca1c 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -31,7 +31,8 @@ target_link_libraries(bare_libc PUBLIC luna)
 
 target_include_directories(bare_libc PUBLIC include/)
 
-target_compile_options(bare_libc PRIVATE -Wall -Wextra -Werror -pedantic -nostdlib -fno-exceptions -fno-rtti)
+target_compile_options(bare_libc PRIVATE -Os -Wall -Wextra -Werror -pedantic -nostdlib)
+target_compile_options(bare_libc PRIVATE -fno-exceptions -fno-rtti)
 
 target_link_options(bare_libc PRIVATE -nostdlib)
 
diff --git a/luna/CMakeLists.txt b/luna/CMakeLists.txt
index 4fbc5114..cf7be482 100644
--- a/luna/CMakeLists.txt
+++ b/luna/CMakeLists.txt
@@ -25,7 +25,7 @@ set(SOURCES
 
 add_library(luna-freestanding ${FREESTANDING_SOURCES})
 target_compile_definitions(luna-freestanding PRIVATE USE_FREESTANDING)
-target_compile_options(luna-freestanding PRIVATE -Wall -Wextra -Werror -Wvla)
+target_compile_options(luna-freestanding PRIVATE -Os -Wall -Wextra -Werror -Wvla)
 target_compile_options(luna-freestanding PRIVATE -Wdisabled-optimization -Wformat=2 -Winit-self -Wsign-conversion)
 target_compile_options(luna-freestanding PRIVATE -Wmissing-include-dirs -Wswitch-default -Wcast-qual -Wundef) 
 target_compile_options(luna-freestanding PRIVATE -Wcast-align -Wwrite-strings -Wlogical-op -Wredundant-decls -Wshadow -Wconversion)
@@ -37,7 +37,7 @@ target_include_directories(luna-freestanding PUBLIC include/)
 set_target_properties(luna-freestanding PROPERTIES CXX_STANDARD 20)
 
 add_library(luna ${SOURCES})
-target_compile_options(luna PRIVATE -Wall -Wextra -Werror -Wvla)
+target_compile_options(luna PRIVATE -Os -Wall -Wextra -Werror -Wvla)
 target_compile_options(luna PRIVATE -Wdisabled-optimization -Wformat=2 -Winit-self)
 target_compile_options(luna PRIVATE -Wmissing-include-dirs -Wswitch-default -Wcast-qual -Wundef) 
 target_compile_options(luna PRIVATE -Wcast-align -Wwrite-strings -Wlogical-op -Wredundant-decls -Wshadow -Wconversion)