diff --git a/src/WASimClient/WASimClient.cpp b/src/WASimClient/WASimClient.cpp
index ac9fd57..4365817 100644
--- a/src/WASimClient/WASimClient.cpp
+++ b/src/WASimClient/WASimClient.cpp
@@ -952,10 +952,14 @@ class WASimClient::Private
 
 	HRESULT setVariable(const VariableRequest &v, const double value)
 	{
-		const string sValue = buildVariableCommandString(v, true);
-		if (sValue.empty() || sValue.length() >= STRSZ_CMD)
-			return E_INVALIDARG;
-		return sendServerCommand(Command(v.createLVar && v.variableType == 'L' ? CommandId::SetCreate : CommandId::Set, v.variableType, sValue.c_str(), value));
+		if (Utilities::isSettableVariableType(v.variableType)) {
+			const string sValue = buildVariableCommandString(v, true);
+			if (sValue.empty() || sValue.length() >= STRSZ_CMD)
+				return E_INVALIDARG;
+			return sendServerCommand(Command(v.createLVar && v.variableType == 'L' ? CommandId::SetCreate : CommandId::Set, v.variableType, sValue.c_str(), value));
+		}
+		LOG_WRN << "Cannot Set a variable of type '" << v.variableType << "'.";
+		return E_INVALIDARG;
 	}
 
 #pragma endregion
diff --git a/src/shared/utilities.h b/src/shared/utilities.h
index e388b43..625bbd6 100644
--- a/src/shared/utilities.h
+++ b/src/shared/utilities.h
@@ -89,6 +89,11 @@ namespace WASimCommander {
 		return find(VAR_TYPES_UNIT_BASED.cbegin(), VAR_TYPES_UNIT_BASED.cend(), type) != VAR_TYPES_UNIT_BASED.cend();
 	}
 
+	static bool isSettableVariableType(const char type) {
+		static const std::vector<char> VAR_TYPES_SETTABLE = { 'A', 'C', 'H', 'K', 'L', 'Z' };
+		return find(VAR_TYPES_SETTABLE.cbegin(), VAR_TYPES_SETTABLE.cend(), type) != VAR_TYPES_SETTABLE.cend();
+	}
+
 	// returns actual byte size from given size which may be one of the SimConnect_AddToClientDataDefinition() dwSizeOrType constants
 	static constexpr uint32_t getActualValueSize(DWORD dwSizeOrType)
 	{