diff --git a/mongoose.h b/mongoose.h
index 5efe4449..a5abc35e 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -43,6 +43,7 @@ extern "C" {
 #define MG_ARCH_CMSIS_RTOS2 13  // CMSIS-RTOS API v2 (Keil RTX5, FreeRTOS)
 #define MG_ARCH_RTTHREAD 14     // RT-Thread RTOS
 #define MG_ARCH_ARMCGT 15       // Texas Semi ARM-CGT
+#define MG_ARCH_CUBE 16	        // STM32Cube environment
 
 #define MG_ARCH_NEWLIB MG_ARCH_ARMGCC  // Alias, deprecate in 2025
 
diff --git a/src/arch.h b/src/arch.h
index 9e67db2b..1d0ef712 100644
--- a/src/arch.h
+++ b/src/arch.h
@@ -16,6 +16,7 @@
 #define MG_ARCH_CMSIS_RTOS2 13  // CMSIS-RTOS API v2 (Keil RTX5, FreeRTOS)
 #define MG_ARCH_RTTHREAD 14     // RT-Thread RTOS
 #define MG_ARCH_ARMCGT 15       // Texas Semi ARM-CGT
+#define MG_ARCH_CUBE 16	        // STM32Cube environment
 
 #define MG_ARCH_NEWLIB MG_ARCH_ARMGCC  // Alias, deprecate in 2025