diff --git a/configure.ac b/configure.ac
index ab951b4f..83cd12b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -442,7 +442,7 @@ AS_CASE(["$ARG_ENABLE_DEBUG"],
    ],
   ["no"], [
       AC_MSG_RESULT([no])
-      #AC_DEFINE([NDEBUG],[1],[Define to disable debug code.])
+      AC_DEFINE([NDEBUG],[1],[Define to disable debug code.])
       #COMPILETIME_OPTIONS="$COMPILETIME_OPTIONS -DNDEBUG "
       DEBUGFLAGS="-Os"
    ],
diff --git a/src/key.cpp b/src/key.cpp
index 1f132f78..71b2a868 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -164,8 +164,10 @@ public:
     void SetSecretBytes(const unsigned char vch[32]) {
         BIGNUM bn;
         BN_init(&bn);
-        assert(BN_bin2bn(vch, 32, &bn));
-        assert(EC_KEY_regenerate_key(pkey, &bn));
+        bool check = BN_bin2bn(vch, 32, &bn);
+        assert(check);
+        check = EC_KEY_regenerate_key(pkey, &bn);
+        assert(check);
         BN_clear_free(&bn);
     }
 
@@ -210,7 +212,8 @@ public:
     bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) {
         unsigned int nSize = ECDSA_size(pkey);
         vchSig.resize(nSize); // Make sure it is big enough
-        assert(ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey));
+        bool check = ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey);
+        assert(check);
         vchSig.resize(nSize); // Shrink to fit actual size
         return true;
     }
diff --git a/src/main.cpp b/src/main.cpp
index cbc9313e..c8b84e61 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1264,7 +1264,8 @@ bool ConnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex, C
     }
 
     // add this block to the view's block chain
-    assert(view.SetBestBlock(pindex));
+    bool check = view.SetBestBlock(pindex);
+    assert(check);
 
     // Watch for transactions paying to me
     for (unsigned int i = 0; i < block.vtx.size(); i++)
@@ -1368,7 +1369,8 @@ bool SetBestChain(CValidationState &state, CBlockIndex* pindexNew)
     // Flush changes to global coin state
     int64 nStart = GetTimeMicros();
     int nModified = view.GetCacheSize();
-    assert(view.Flush());
+    bool check = view.Flush();
+    assert(check);
     int64 nTime = GetTimeMicros() - nStart;
     if (fBenchmark)
         printf("- Flush %i transactions: %.2fms (%.4fms/tx)\n", nModified, 0.001 * nTime, 0.001 * nTime / nModified);