diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -100,7 +100,7 @@
 static void AddRandomOutboundPeer(const Config &config,
                                   std::vector<std::unique_ptr<CNode>> &vNodes,
                                   PeerLogicValidation &peerLogic) {
-    CAddress addr(ip(insecure_rand_ctx.randbits(32)), NODE_NONE);
+    CAddress addr(ip(g_insecure_rand_ctx.randbits(32)), NODE_NONE);
     vNodes.emplace_back(new CNode(id++, ServiceFlags(NODE_NETWORK), 0,
                                   INVALID_SOCKET, addr, 0, 0, CAddress(), "",
                                   /*fInboundIn=*/false));
diff --git a/src/test/test_bitcoin.h b/src/test/test_bitcoin.h
--- a/src/test/test_bitcoin.h
+++ b/src/test/test_bitcoin.h
@@ -22,26 +22,26 @@
  */
 #define NULLPTR(T) static_cast<T *>(nullptr)
 
-extern FastRandomContext insecure_rand_ctx;
+thread_local extern FastRandomContext g_insecure_rand_ctx;
 
 static inline void SeedInsecureRand(bool deterministic = false) {
-    insecure_rand_ctx = FastRandomContext(deterministic);
+    g_insecure_rand_ctx = FastRandomContext(deterministic);
 }
 
 static inline uint32_t InsecureRand32() {
-    return insecure_rand_ctx.rand32();
+    return g_insecure_rand_ctx.rand32();
 }
 static inline uint256 InsecureRand256() {
-    return insecure_rand_ctx.rand256();
+    return g_insecure_rand_ctx.rand256();
 }
 static inline uint64_t InsecureRandBits(int bits) {
-    return insecure_rand_ctx.randbits(bits);
+    return g_insecure_rand_ctx.randbits(bits);
 }
 static inline uint64_t InsecureRandRange(uint64_t range) {
-    return insecure_rand_ctx.randrange(range);
+    return g_insecure_rand_ctx.randrange(range);
 }
 static inline bool InsecureRandBool() {
-    return insecure_rand_ctx.randbool();
+    return g_insecure_rand_ctx.randbool();
 }
 
 /**
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -15,6 +15,7 @@
 #include <logging.h>
 #include <miner.h>
 #include <net_processing.h>
+#include <noui.h>
 #include <pubkey.h>
 #include <random.h>
 #include <rpc/register.h>
@@ -45,9 +46,7 @@
     g_connman->vNodes.clear();
 }
 
-FastRandomContext insecure_rand_ctx;
-
-extern void noui_connect();
+thread_local FastRandomContext g_insecure_rand_ctx;
 
 std::ostream &operator<<(std::ostream &os, const uint256 &num) {
     os << num.ToString();