diff --git a/Libraries/CMSIS/Device/Maxim/GCC/gcc.mk b/Libraries/CMSIS/Device/Maxim/GCC/gcc.mk
index 432edae4e8..1bb8093c69 100644
--- a/Libraries/CMSIS/Device/Maxim/GCC/gcc.mk
+++ b/Libraries/CMSIS/Device/Maxim/GCC/gcc.mk
@@ -300,8 +300,8 @@ PROJ_AFLAGS += -DIS_SECURE_ENVIRONMENT=1
 PROJ_CFLAGS += -DIS_SECURE_ENVIRONMENT=1
 else
 # Align with Zephyr flags.
-PROJ_AFLAGS += -DCONFIG_TRUSTED_EXECUTION_SECURE=0
-PROJ_CFLAGS += -DCONFIG_TRUSTED_EXECUTION_SECURE=0
+# Do not define CONFIG_TRUSTED_EXECUTION_SECURE
+# not defining means 0
 
 # Leaving these to support initial development.
 PROJ_AFLAGS += -DIS_SECURE_ENVIRONMENT=0