diff --git a/src/libwolfboot.c b/src/libwolfboot.c
index 17b4e07774..ca2c469224 100644
--- a/src/libwolfboot.c
+++ b/src/libwolfboot.c
@@ -742,7 +742,7 @@ void RAMFUNCTION wolfBoot_update_trigger(void)
 
     /* if PART_UPDATE_ENDFLAGS straddles a sector, (all non FLAGS_HOME builds)
      * align it to the correct sector */
-    if (PART_UPDATE_ENDFLAGS % WOLFBOOT_SECTOR_SIZE == 0)
+    if (PART_UPDATE_ENDFLAGS % WOLFBOOT_SECTOR_SIZE != 0)
         lastSector -= WOLFBOOT_SECTOR_SIZE;
 
     /* erase the sector flags */