diff --git a/include/lib/cpus/aarch32/cortex_a17.h b/include/lib/cpus/aarch32/cortex_a17.h
index 4b05216..89a8eb6 100644
--- a/include/lib/cpus/aarch32/cortex_a17.h
+++ b/include/lib/cpus/aarch32/cortex_a17.h
@@ -19,4 +19,9 @@
  ******************************************************************************/
 #define CORTEX_A17_ACTLR_SMP_BIT	(U(1) << 6)
 
+/*******************************************************************************
+ * Implementation defined register specific definitions.
+ ******************************************************************************/
+#define CORTEX_A17_IMP_DEF_REG1		p15, 0, c15, c0, 1
+
 #endif /* CORTEX_A17_H */