diff --git a/os/hal/ports/SAMA/SAMA5D2x/hal_lld.h b/os/hal/ports/SAMA/SAMA5D2x/hal_lld.h
index f090126da..643afa66e 100644
--- a/os/hal/ports/SAMA/SAMA5D2x/hal_lld.h
+++ b/os/hal/ports/SAMA/SAMA5D2x/hal_lld.h
@@ -185,6 +185,7 @@
 #define SAMA_MCK_MDIV_DIV4      (2 << 8)    /**< MCK is divided by 4.      */
 
 #define SAMA_MCK_PLLADIV2       (1 << 12)   /**< PLLA is divided by 2.     */
+
 /** @} */
 
 /*===========================================================================*/
@@ -405,6 +406,18 @@
 #error "PLLADIV2 must be always enabled when Main Clock Divider is 3"
 #endif
 
+/**
+ * @brief   Matrix H64H32 clock ratio.
+ */
+
+#if ((SAMA_H64MX_H32MX_RATIO == 2) || defined(__DOXYGEN__))
+#define SAMA_H64MX_H32MX_DIV  PMC_MCKR_H32MXDIV_H32MXDIV2
+#elif (SAMA_H64MX_H32MX_RATIO == 1)
+#define SAMA_H64MX_H32MX_DIV  PMC_MCKR_H32MXDIV_H32MXDIV1
+#else
+#error "H64MX H32MX clock ratio out of range."
+#endif
+
 /**
  * @brief   Processor Clock frequency.
  */