diff --git a/library/des.c b/library/des.c
index 6e15234..7da3269 100644
--- a/library/des.c
+++ b/library/des.c
@@ -781,11 +781,6 @@
     0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23
 };
 
-static const unsigned char des3_test_iv[8] =
-{
-    0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF,
-};
-
 static const unsigned char des3_test_buf[8] =
 {
     0x4E, 0x6F, 0x77, 0x20, 0x69, 0x73, 0x20, 0x74
@@ -805,6 +800,12 @@
     { 0xDD, 0x17, 0xE8, 0xB8, 0xB4, 0x37, 0xD2, 0x32 }
 };
 
+#if defined(POLARSSL_CIPHER_MODE_CBC)
+static const unsigned char des3_test_iv[8] =
+{
+    0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF,
+};
+
 static const unsigned char des3_test_cbc_dec[3][8] =
 {
     { 0x12, 0x9F, 0x40, 0xB9, 0xD2, 0x00, 0x56, 0xB3 },
@@ -818,6 +819,7 @@
     { 0x35, 0x76, 0x11, 0x56, 0x5F, 0xA1, 0x8E, 0x4D },
     { 0xCB, 0x19, 0x1F, 0x85, 0xD1, 0xED, 0x84, 0x39 }
 };
+#endif /* POLARSSL_CIPHER_MODE_CBC */
 
 /*
  * Checkup routine