diff --git a/test/evp_libctx_test.c b/test/evp_libctx_test.c
index 2448c35a149f60..9290a2d7a4583a 100644
--- a/test/evp_libctx_test.c
+++ b/test/evp_libctx_test.c
@@ -334,7 +334,11 @@ static int test_cipher_reinit(int test_id)
         0x03, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     };
-    unsigned char iv[16] = {
+    unsigned char iv[48] = {
+        0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
+        0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+        0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
+        0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
         0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
         0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00
     };
@@ -425,7 +429,11 @@ static int test_cipher_reinit_partialupdate(int test_id)
         0x03, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     };
-    static const unsigned char iv[16] = {
+    static const unsigned char iv[48] = {
+        0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
+        0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+        0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
+        0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
         0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
         0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00
     };