diff --git a/include/libopencm3/lpc43xx/eventrouter.h b/include/libopencm3/lpc43xx/eventrouter.h
index ef5ac694..d27c67ce 100644
--- a/include/libopencm3/lpc43xx/eventrouter.h
+++ b/include/libopencm3/lpc43xx/eventrouter.h
@@ -51,7 +51,7 @@ LGPL License Terms @ref lgpl_license
 #define EVENTROUTER_CLR_EN              MMIO32(EVENTROUTER_BASE + 0xFD8)
 
 /* Set event enable register */
-#define EVENTROUTER_ET_EN               MMIO32(EVENTROUTER_BASE + 0xFDC)
+#define EVENTROUTER_SET_EN              MMIO32(EVENTROUTER_BASE + 0xFDC)
 
 /* Event Status register */
 #define EVENTROUTER_STATUS              MMIO32(EVENTROUTER_BASE + 0xFE0)