diff --git a/include/polarssl/dhm.h b/include/polarssl/dhm.h
index 4a479d6..94ad015 100644
--- a/include/polarssl/dhm.h
+++ b/include/polarssl/dhm.h
@@ -32,12 +32,12 @@
 /*
  * DHM Error codes
  */
-#define POLARSSL_ERR_DHM_BAD_INPUT_DATA                    0x0480
-#define POLARSSL_ERR_DHM_READ_PARAMS_FAILED                0x0490
-#define POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED                0x04A0
-#define POLARSSL_ERR_DHM_READ_PUBLIC_FAILED                0x04B0
-#define POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED                0x04C0
-#define POLARSSL_ERR_DHM_CALC_SECRET_FAILED                0x04D0
+#define POLARSSL_ERR_DHM_BAD_INPUT_DATA                    -0x3080  /**< Bad input parameters to function. */
+#define POLARSSL_ERR_DHM_READ_PARAMS_FAILED                -0x3100  /**< Reading of the DHM parameters failed. */
+#define POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED                -0x3180  /**< Making of the DHM parameters failed. */
+#define POLARSSL_ERR_DHM_READ_PUBLIC_FAILED                -0x3200  /**< Reading of the public values failed. */
+#define POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED                -0x3280  /**< Makeing of the public value failed. */
+#define POLARSSL_ERR_DHM_CALC_SECRET_FAILED                -0x3300  /**< Calculation of the DHM secret failed. */
 
 /**
  * \brief          DHM context structure