diff --git a/test/acvp_test.c b/test/acvp_test.c
index 89b5400..d8425f0 100644
--- a/test/acvp_test.c
+++ b/test/acvp_test.c
@@ -1261,7 +1261,7 @@
 
     test_output_memory("n", n, n_len);
     test_output_memory("e", e, e_len);
-    if (!EVP_PKEY_decrypt(ctx, pt, &pt_len, tst->ct, tst->ct_len))
+    if (EVP_PKEY_decrypt(ctx, pt, &pt_len, tst->ct, tst->ct_len) <= 0)
         TEST_note("Decryption Failed");
     else
         test_output_memory("pt", pt, pt_len);
diff --git a/test/evp_extra_test.c b/test/evp_extra_test.c
index 7026753..444b279 100644
--- a/test/evp_extra_test.c
+++ b/test/evp_extra_test.c
@@ -1940,8 +1940,8 @@
         if (!TEST_true(EVP_PKEY_CTX_set_params(cctx, sparams)))
             goto done;
 
-        if (!TEST_true(EVP_PKEY_decrypt(cctx, plaintext, &ptext_len, ciphertext,
-                                        ctext_len)))
+        if (!TEST_int_gt(EVP_PKEY_decrypt(cctx, plaintext, &ptext_len, ciphertext,
+                                        ctext_len), 0))
             goto done;
 
         if (!TEST_true(EVP_PKEY_CTX_get_params(cctx, gparams)))
diff --git a/test/threadstest.c b/test/threadstest.c
index cfd5991..73cc072 100644
--- a/test/threadstest.c
+++ b/test/threadstest.c
@@ -410,7 +410,7 @@
     char *msg = "Hello World";
     unsigned char ctbuf[256];
     unsigned char ptbuf[256];
-    size_t ptlen = sizeof(ptbuf), ctlen = sizeof(ctbuf);
+    size_t ptlen, ctlen = sizeof(ctbuf);
     EVP_PKEY_CTX *ctx = NULL;
     int success = 0;
     int i;
@@ -436,8 +436,9 @@
         if (!TEST_ptr(ctx))
             goto err;
 
+        ptlen = sizeof(ptbuf);
         if (!TEST_int_ge(EVP_PKEY_decrypt_init(ctx), 0)
-                || !TEST_int_ge(EVP_PKEY_decrypt(ctx, ptbuf, &ptlen, ctbuf, ctlen),
+                || !TEST_int_gt(EVP_PKEY_decrypt(ctx, ptbuf, &ptlen, ctbuf, ctlen),
                                                 0)
                 || !TEST_mem_eq(msg, strlen(msg), ptbuf, ptlen))
             goto err;