diff --git a/libctru/include/3ds/applets/miiselector.h b/libctru/include/3ds/applets/miiselector.h
index e52c64f..5622e8f 100644
--- a/libctru/include/3ds/applets/miiselector.h
+++ b/libctru/include/3ds/applets/miiselector.h
@@ -108,4 +108,4 @@ Result miiSelectorLaunch(MiiSelectorContext *ctx);
  *
  * @return `true` if `returnbuf->checksum` is the same as the one computed from `returnbuf`
  */
-bool miiSelectorChecksumIsValid(MiiSelectorReturn *returnbuf);
+bool miiSelectorChecksumIsValid(const MiiSelectorReturn *returnbuf);
diff --git a/libctru/source/applets/miiselector.c b/libctru/source/applets/miiselector.c
index a1f56a4..c591ac0 100644
--- a/libctru/source/applets/miiselector.c
+++ b/libctru/source/applets/miiselector.c
@@ -33,7 +33,7 @@ static u16 crc16_ccitt(void const *buf, size_t len, uint32_t starting_val)
 	return (u16)(crc & 0xffff);
 }
 
-bool miiSelectorChecksumIsValid(MiiSelectorReturn *returnbuf)
+bool miiSelectorChecksumIsValid(const MiiSelectorReturn *returnbuf)
 {
 	u16 computed =
 	    crc16_ccitt(&returnbuf->mii, sizeof(returnbuf->mii) + sizeof(returnbuf->_pad0x68), 0x0000);