diff --git a/os/ports/GCC/ARMCMx/STM32F2xx/cmparams.h b/os/ports/GCC/ARMCMx/STM32F2xx/cmparams.h
index 41bbc2563..56bbfe449 100644
--- a/os/ports/GCC/ARMCMx/STM32F2xx/cmparams.h
+++ b/os/ports/GCC/ARMCMx/STM32F2xx/cmparams.h
@@ -35,7 +35,7 @@
 /**
  * @brief   Cortex core model.
  */
-#define CORTEX_MODEL            CORTEX_M4
+#define CORTEX_MODEL            CORTEX_M3
 
 /**
  * @brief   Systick unit presence.