diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 6569a47..6f577f9 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -562,15 +562,6 @@
    doesn't print anything to the console. If ``PLAT_LOG_LEVEL_ASSERT`` isn't
    defined, it defaults to ``LOG_LEVEL``.
 
-If the platform port uses the Activity Monitor Unit, the following constant
-may be defined:
-
--  **PLAT_AMU_GROUP1_COUNTERS_MASK**
-   This mask reflects the set of group counters that should be enabled.  The
-   maximum number of group 1 counters supported by AMUv1 is 16 so the mask
-   can be at most 0xffff. If the platform does not define this mask, no group 1
-   counters are enabled.
-
 File : plat_macros.S [mandatory]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/include/lib/extensions/amu.h b/include/lib/extensions/amu.h
index 3a254c9..768e72c 100644
--- a/include/lib/extensions/amu.h
+++ b/include/lib/extensions/amu.h
@@ -20,11 +20,7 @@
 #define AMU_GROUP0_COUNTERS_MASK	U(0xf)
 #define AMU_GROUP0_NR_COUNTERS		U(4)
 
-#ifdef PLAT_AMU_GROUP1_COUNTERS_MASK
-#define AMU_GROUP1_COUNTERS_MASK	PLAT_AMU_GROUP1_COUNTERS_MASK
-#else
 #define AMU_GROUP1_COUNTERS_MASK	U(0)
-#endif
 
 /* Calculate number of group 1 counters */
 #if (AMU_GROUP1_COUNTERS_MASK	& (1 << 15))