diff --git a/core/HalfLife2.cpp b/core/HalfLife2.cpp
index 83efe985..2e0c9f8b 100644
--- a/core/HalfLife2.cpp
+++ b/core/HalfLife2.cpp
@@ -1278,6 +1278,8 @@ bool CHalfLife2::IsMapValid(const char *map)
 	return FindMap(szTmp, sizeof(szTmp)) != SMFindMapResult::NotFound;
 }
 
+// TODO: Add ep1 support for this. (No IServerTools available there)
+#if SOURCE_ENGINE >= SE_ORANGEBOX
 string_t CHalfLife2::AllocPooledString(const char *pszValue)
 {
 	// This is admittedly a giant hack, but it's a relatively safe method for
@@ -1311,3 +1313,4 @@ string_t CHalfLife2::AllocPooledString(const char *pszValue)
 
 	return newString;
 }
+#endif
diff --git a/core/HalfLife2.h b/core/HalfLife2.h
index a4abd4ff..2e871d45 100644
--- a/core/HalfLife2.h
+++ b/core/HalfLife2.h
@@ -183,7 +183,9 @@ public: //IGameHelpers
 	const char *GetEntityClassname(CBaseEntity *pEntity);
 	bool IsMapValid(const char *map);
 	SMFindMapResult FindMap(char *pMapName, int nMapNameMax);
+#if SOURCE_ENGINE >= SE_ORANGEBOX
 	string_t AllocPooledString(const char *pszValue);
+#endif
 public:
 	void AddToFakeCliCmdQueue(int client, int userid, const char *cmd);
 	void ProcessFakeCliCmdQueue();
diff --git a/core/smn_entities.cpp b/core/smn_entities.cpp
index edcc2ad8..0b8c3bc9 100644
--- a/core/smn_entities.cpp
+++ b/core/smn_entities.cpp
@@ -2127,8 +2127,12 @@ static cell_t SetEntPropString(IPluginContext *pContext, const cell_t *params)
 
 	if (bIsStringIndex)
 	{
+#if SOURCE_ENGINE < SE_ORANGEBOX
+		return pContext->ThrowNativeError("Cannot set %s. Setting string_t values not supported on this game.", prop);
+#else
 		*(string_t *) ((intptr_t) pEntity + offset) = g_HL2.AllocPooledString(src);
 		len = strlen(src);
+#endif
 	}
 	else
 	{