diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index c890dcf2f..0e3017d67 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -661,12 +661,24 @@ bool CompilerStack::compile(State _stopAfter)
 
 		string const evmAssemblyJsonSource = m_evmAssemblyJson.begin()->first;
 
+		evmasm::Assembly::OptimiserSettings optimiserSettings;
+		optimiserSettings.evmVersion = m_evmVersion;
+		optimiserSettings.expectedExecutionsPerDeployment = m_optimiserSettings.expectedExecutionsPerDeployment;
+		optimiserSettings.runCSE = m_optimiserSettings.runCSE;
+		optimiserSettings.runConstantOptimiser = m_optimiserSettings.runConstantOptimiser;
+		optimiserSettings.runDeduplicate = m_optimiserSettings.runDeduplicate;
+		optimiserSettings.runInliner = m_optimiserSettings.runInliner;
+		optimiserSettings.runJumpdestRemover = m_optimiserSettings.runJumpdestRemover;
+		optimiserSettings.runPeephole = m_optimiserSettings.runPeephole;
+
 		m_contracts[evmAssemblyJsonSource].evmAssembly = make_shared<evmasm::Assembly>(evmAssemblyJsonSource);
 		m_contracts[evmAssemblyJsonSource].evmAssembly->loadFromAssemblyJSON(m_evmAssemblyJson[evmAssemblyJsonSource]);
+		m_contracts[evmAssemblyJsonSource].evmAssembly->optimise(optimiserSettings);
 		m_contracts[evmAssemblyJsonSource].object = m_contracts[evmAssemblyJsonSource].evmAssembly->assemble();
 
 		m_contracts[evmAssemblyJsonSource].evmRuntimeAssembly = make_shared<evmasm::Assembly>(evmAssemblyJsonSource);
 		m_contracts[evmAssemblyJsonSource].evmRuntimeAssembly->loadFromAssemblyJSON(m_evmAssemblyJson[evmAssemblyJsonSource][".data"]["0"]);
+		m_contracts[evmAssemblyJsonSource].evmRuntimeAssembly->optimise(optimiserSettings);
 		m_contracts[evmAssemblyJsonSource].runtimeObject = m_contracts[evmAssemblyJsonSource].evmRuntimeAssembly->assemble();
 	}
 	else
diff --git a/solc/CommandLineParser.cpp b/solc/CommandLineParser.cpp
index acfc09c87..6cf664c89 100644
--- a/solc/CommandLineParser.cpp
+++ b/solc/CommandLineParser.cpp
@@ -1218,12 +1218,15 @@ bool CommandLineParser::processArgs()
 		}
 		if (m_options.optimizer.enabled && (m_options.assembly.inputLanguage != Input::StrictAssembly && m_options.assembly.inputLanguage != Input::Ewasm))
 		{
-			serr() <<
-				"Optimizer can only be used for strict assembly. Use --" <<
-				g_strStrictAssembly <<
-				"." <<
-				endl;
-			return false;
+			if (m_options.input.mode != InputMode::CompilerWithEvmAssemblyJsonImport)
+			{
+				serr() <<
+					"Optimizer can only be used for strict assembly or with assembly import. Use --" <<
+					g_strStrictAssembly <<
+					" or --" << g_strImportEvmAssemblerJson << "." <<
+					endl;
+				return false;
+			}
 		}
 		if (m_options.assembly.targetMachine == Machine::Ewasm && m_options.assembly.inputLanguage != Input::StrictAssembly && m_options.assembly.inputLanguage != Input::Ewasm)
 		{