diff --git a/include/lib/extensions/mpam.h b/include/lib/extensions/mpam.h
index 414adcb..120a921 100644
--- a/include/lib/extensions/mpam.h
+++ b/include/lib/extensions/mpam.h
@@ -9,6 +9,12 @@
 
 #include <stdbool.h>
 
+#if ENABLE_MPAM_FOR_LOWER_ELS
 void mpam_enable(bool el2_unused);
+#else
+void mpam_enable(bool el2_unused)
+{
+}
+#endif
 
 #endif /* MPAM_H */