diff --git a/firmware/asdf/src/CMakeLists.txt b/firmware/asdf/src/CMakeLists.txt
index e5e281b..36c5a09 100644
--- a/firmware/asdf/src/CMakeLists.txt
+++ b/firmware/asdf/src/CMakeLists.txt
@@ -8,7 +8,7 @@ temporary_config_file(${ASDF_SRC_DIR}/Arch/asdf_arch_${ARCH}.c ${CMAKE_CURRENT_B
 temporary_config_file(${ASDF_SRC_DIR}/Keymaps/asdf_all_keymap_defs_${KEYMAP}.h ${CMAKE_CURRENT_BINARY_DIR}/asdf_keymap_defs.h)
 
 
-list(APPEND C_FLAGS
+list(APPEND CFLAGS
   -std=c99
   -Wall
   -funsigned-char
diff --git a/firmware/asdf/test/CmakeLists.txt b/firmware/asdf/test/CmakeLists.txt
index 83c5a69..80aef12 100644
--- a/firmware/asdf/test/CmakeLists.txt
+++ b/firmware/asdf/test/CmakeLists.txt
@@ -3,7 +3,7 @@ configure_file(${ASDF_SRC_DIR}/Arch/asdf_arch_test.c asdf_arch.c)
 configure_file(${ASDF_SRC_DIR}/Arch/asdf_arch_test.h asdf_arch.h)
 
 
-list(APPEND C_FLAGS
+list(APPEND CFLAGS
   "-std=c99"
   "-Wall"
   "-Wextra"