diff --git a/core/ADTFactory.cpp b/core/ADTFactory.cpp
index 4a41ddae..c9185662 100644
--- a/core/ADTFactory.cpp
+++ b/core/ADTFactory.cpp
@@ -58,3 +58,8 @@ void BaseTrie::Destroy()
 {
 	delete this;
 }
+
+bool BaseTrie::Replace(const char *key, void *value)
+{
+	return sm_trie_replace(m_pTrie, key, value);
+}
diff --git a/core/ADTFactory.h b/core/ADTFactory.h
index 08d8b83a..aeb6b242 100644
--- a/core/ADTFactory.h
+++ b/core/ADTFactory.h
@@ -10,6 +10,7 @@ public:
 	BaseTrie();
 	virtual ~BaseTrie();
 	virtual bool Insert(const char *key, void *value);
+	virtual bool Replace(const char *key, void *value);
 	virtual bool Retrieve(const char *key, void **value);
 	virtual bool Delete(const char *key);
 	virtual void Clear();
diff --git a/core/GameConfigs.cpp b/core/GameConfigs.cpp
index e30d6aa9..58590a7b 100644
--- a/core/GameConfigs.cpp
+++ b/core/GameConfigs.cpp
@@ -190,11 +190,11 @@ SMCParseResult CGameConfig::ReadSMC_KeyValue(const char *key, const char *value,
 			strncopy(m_prop, value, sizeof(m_prop));
 		} else if (strcmp(key, PLATFORM_NAME) == 0) {
 			int val = atoi(value);
-			sm_trie_insert(m_pOffsets, m_offset, (void *)val);
+			sm_trie_replace(m_pOffsets, m_offset, (void *)val);
 		}
 	} else if (m_ParseState == PSTATE_GAMEDEFS_KEYS) {
 		int id = m_pStrings->AddString(value);
-		sm_trie_insert(m_pKeys, key, (void *)id);
+		sm_trie_replace(m_pKeys, key, (void *)id);
 	} else if (m_ParseState == PSTATE_GAMEDEFS_SUPPORTED) {
 		if (strcmp(key, "game") == 0
 			&& strcmp(value, g_mod) == 0)
@@ -249,8 +249,8 @@ SMCParseResult CGameConfig::ReadSMC_LeavingSection()
 				if (pProp)
 				{
 					int val = pProp->GetOffset();
-					sm_trie_insert(m_pOffsets, m_offset, (void *)val);
-					sm_trie_insert(m_pProps, m_offset, pProp);
+					sm_trie_replace(m_pOffsets, m_offset, (void *)val);
+					sm_trie_replace(m_pProps, m_offset, pProp);
 				} else {
 					/* Check if it's a non-default game and no offsets exist */
 					if (((strcmp(m_mod, "*") != 0) && strcmp(m_mod, "#default") != 0)
@@ -383,7 +383,7 @@ SMCParseResult CGameConfig::ReadSMC_LeavingSection()
 #if defined PLATFORM_LINUX
 skip_find:
 #endif
-			sm_trie_insert(m_pSigs, m_offset, final_addr);
+			sm_trie_replace(m_pSigs, m_offset, final_addr);
 			m_ParseState = PSTATE_GAMEDEFS_SIGNATURES;
 
 			break;
diff --git a/core/sm_trie.cpp b/core/sm_trie.cpp
index c7dbfa4e..df61a740 100644
--- a/core/sm_trie.cpp
+++ b/core/sm_trie.cpp
@@ -388,7 +388,7 @@ bool sm_trie_retrieve(Trie *trie, const char *key, void **value)
 	return true;
 }
 
-bool sm_trie_insert(Trie *trie, const char *key, void *value)
+bool sm_trie_add(Trie *trie, const char *key, void *value, bool replace_allowed)
 {
 	unsigned int lastidx = 1;		/* the last node index */
 	unsigned int curidx;			/* current node index */
@@ -803,7 +803,7 @@ bool sm_trie_insert(Trie *trie, const char *key, void *value)
 	 */
 	assert(node->mode == Node_Arc);
 
-	if (!node->valset)
+	if (!node->valset || replace_allowed)
 	{
 		/* Insert is only possible if we have no production */
 		node->valset = true;
@@ -813,3 +813,13 @@ bool sm_trie_insert(Trie *trie, const char *key, void *value)
 
 	return false;
 }
+
+bool sm_trie_insert(Trie *trie, const char *key, void *value)
+{
+	return sm_trie_add(trie, key, value, false);
+}
+
+bool sm_trie_replace(Trie *trie, const char *key, void *value)
+{
+	return sm_trie_add(trie, key, value, true);
+}
diff --git a/core/sm_trie.h b/core/sm_trie.h
index 2e7ddf37..b3162f27 100644
--- a/core/sm_trie.h
+++ b/core/sm_trie.h
@@ -20,6 +20,7 @@ struct Trie;
 Trie *sm_trie_create();
 void sm_trie_destroy(Trie *trie);
 bool sm_trie_insert(Trie *trie, const char *key, void *value);
+bool sm_trie_replace(Trie *trie, const char *key, void *value);
 bool sm_trie_retrieve(Trie *trie, const char *key, void **value);
 bool sm_trie_delete(Trie *trie, const char *key);
 void sm_trie_clear(Trie *trie);
diff --git a/public/IADTFactory.h b/public/IADTFactory.h
index ce03c223..126c86f8 100644
--- a/public/IADTFactory.h
+++ b/public/IADTFactory.h
@@ -4,7 +4,7 @@
 #include <IShareSys.h>
 
 #define SMINTERFACE_ADTFACTORY_NAME		"IADTFactory"
-#define SMINTERFACE_ADTFACTORY_VERSION	1
+#define SMINTERFACE_ADTFACTORY_VERSION	2
 
 /**
 * @file IADTFactory.h
@@ -55,6 +55,16 @@ namespace SourceMod
 		 * memory.
 		 */
 		virtual void Destroy() =0;
+
+		/**
+		 * @brief Inserts a key/value pair, replacing an old inserted
+		 * value if it already exists.
+		 *
+		 * @param key		Key string (null terminated).
+		 * @param value		Value pointer (may be anything).
+		 * @return			True on success, false on failure.
+		 */
+		virtual bool Replace(const char *key, void *value) =0;
 	};
 
 	class IADTFactory : public SMInterface