diff --git a/os/hal/boards/OLIMEX_STM32_103STK/board.h b/os/hal/boards/OLIMEX_STM32_103STK/board.h
index bb3ea3e72..97f9a2c6a 100644
--- a/os/hal/boards/OLIMEX_STM32_103STK/board.h
+++ b/os/hal/boards/OLIMEX_STM32_103STK/board.h
@@ -36,7 +36,7 @@
 /*
  * MCU type, supported types are defined in ./os/hal/platforms/hal_lld.h.
  */
-#define STM32F10X_MD
+#define STM32F103xB
 
 /*
  * IO pins assignments.