diff --git a/src/main.cpp b/src/main.cpp
index d130e9705eb..174c9934531 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2238,7 +2238,7 @@ void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd)
 
 bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp)
 {
-    AssertLockHeld("cs_main");
+    AssertLockHeld(cs_main);
 
     // Check for duplicate
     uint256 hash = pblock->GetHash();
diff --git a/src/sync.cpp b/src/sync.cpp
index 9a20c87f888..b57d8c3c00a 100644
--- a/src/sync.cpp
+++ b/src/sync.cpp
@@ -136,11 +136,11 @@ std::string LocksHeld()
     return result;
 }
 
-void AssertLockHeld(std::string strName)
+void AssertLockHeldInternal(const char *pszName, const char* pszFile, int nLine, void *cs)
 {
     BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)&i, *lockstack)
-        if (i.second.MutexName() == strName) return;
-    LogPrintf("Lock %s not held; locks held:\n%s", strName.c_str(), LocksHeld().c_str());
+        if (i.first == cs) return;
+    LogPrintf("Lock %s not held in %s:%i; locks held:\n%s", pszName, pszFile, nLine, LocksHeld().c_str());
     assert(0);
 }
 
diff --git a/src/sync.h b/src/sync.h
index c50abf81b63..077ed59b894 100644
--- a/src/sync.h
+++ b/src/sync.h
@@ -88,12 +88,13 @@ typedef AnnotatedMixin<boost::mutex> CWaitableCriticalSection;
 void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
 void LeaveCritical();
 std::string LocksHeld();
-void AssertLockHeld(std::string strName);
+void AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void *cs);
 #else
 void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {}
 void static inline LeaveCritical() {}
-void static inline AssertLockHeld(std::string) {}
+void static inline AssertLockHeldInternal(const char* pszName, const char* pszFile, int nLine, void *cs) {}
 #endif
+#define AssertLockHeld(cs) AssertLockHeldInternal(#cs, __FILE__, __LINE__, &cs)
 
 #ifdef DEBUG_LOCKCONTENTION
 void PrintLockContention(const char* pszName, const char* pszFile, int nLine);