diff --git a/armsrc/Makefile b/armsrc/Makefile
index b70642be..7348fda6 100644
--- a/armsrc/Makefile
+++ b/armsrc/Makefile
@@ -25,7 +25,7 @@ SRC_ISO15693 = iso15693.c iso15693tools.c
 SRC_ISO14443a = epa.c iso14443a.c mifareutil.c mifarecmd.c mifaresniff.c mifaresim.c
 SRC_ISO14443b = iso14443b.c
 SRC_CRAPTO1 = crypto1.c 
-SRC_DES = des.c platform_util_arm.c
+SRC_DES = platform_util_arm.c des.c
 SRC_CRC = iso14443crc.c crc.c crc16.c crc32.c parity.c
 SRC_SMARTCARD = i2c.c