diff --git a/test/tools/ossfuzz/protoToYul.cpp b/test/tools/ossfuzz/protoToYul.cpp
index 03f0d2c39..36c779d9a 100644
--- a/test/tools/ossfuzz/protoToYul.cpp
+++ b/test/tools/ossfuzz/protoToYul.cpp
@@ -30,6 +30,7 @@
 using namespace std;
 using namespace solidity::yul::test::yul_fuzzer;
 using namespace solidity::yul::test;
+using namespace solidity::langutil;
 using namespace solidity::util;
 using namespace solidity;
 
@@ -86,26 +87,26 @@ string ProtoConverter::createAlphaNum(string const& _strBytes)
 	return tmp;
 }
 
-langutil::EVMVersion ProtoConverter::evmVersionMapping(Program_Version const& _ver)
+EVMVersion ProtoConverter::evmVersionMapping(Program_Version const& _ver)
 {
 	switch (_ver)
 	{
 	case Program::HOMESTEAD:
-		return langutil::EVMVersion::homestead();
+		return EVMVersion::homestead();
 	case Program::TANGERINE:
-		return langutil::EVMVersion::tangerineWhistle();
+		return EVMVersion::tangerineWhistle();
 	case Program::SPURIOUS:
-		return langutil::EVMVersion::spuriousDragon();
+		return EVMVersion::spuriousDragon();
 	case Program::BYZANTIUM:
-		return langutil::EVMVersion::byzantium();
+		return EVMVersion::byzantium();
 	case Program::CONSTANTINOPLE:
-		return langutil::EVMVersion::constantinople();
+		return EVMVersion::constantinople();
 	case Program::PETERSBURG:
-		return langutil::EVMVersion::petersburg();
+		return EVMVersion::petersburg();
 	case Program::ISTANBUL:
-		return langutil::EVMVersion::istanbul();
+		return EVMVersion::istanbul();
 	case Program::BERLIN:
-		return langutil::EVMVersion::berlin();
+		return EVMVersion::berlin();
 	}
 }
 
diff --git a/test/tools/ossfuzz/protoToYul.h b/test/tools/ossfuzz/protoToYul.h
index 2814f9266..fa6455c90 100644
--- a/test/tools/ossfuzz/protoToYul.h
+++ b/test/tools/ossfuzz/protoToYul.h
@@ -60,7 +60,7 @@ public:
 	std::string programToString(Program const& _input);
 
 	/// Returns evm version
-	langutil::EVMVersion version()
+	solidity::langutil::EVMVersion version()
 	{
 		return m_evmVersion;
 	}
@@ -281,7 +281,7 @@ private:
 
 	/// Returns an EVMVersion object corresponding to the protobuf
 	/// enum of type Program_Version
-	langutil::EVMVersion evmVersionMapping(Program_Version const& _x);
+	solidity::langutil::EVMVersion evmVersionMapping(Program_Version const& _x);
 
 	/// Returns a monotonically increasing counter that starts from zero.
 	unsigned counter()
@@ -382,6 +382,6 @@ private:
 	/// block is enabled.
 	bool m_forInitScopeExtEnabled;
 	/// Object that holds the targeted evm version specified by protobuf input
-	langutil::EVMVersion m_evmVersion;
+	solidity::langutil::EVMVersion m_evmVersion;
 };
 }
diff --git a/test/tools/ossfuzz/yulProtoFuzzer.cpp b/test/tools/ossfuzz/yulProtoFuzzer.cpp
index bca65e4c3..b834ddc92 100644
--- a/test/tools/ossfuzz/yulProtoFuzzer.cpp
+++ b/test/tools/ossfuzz/yulProtoFuzzer.cpp
@@ -29,6 +29,7 @@
 using namespace solidity;
 using namespace solidity::yul;
 using namespace solidity::yul::test::yul_fuzzer;
+using namespace solidity::langutil;
 using namespace std;
 
 DEFINE_PROTO_FUZZER(Program const& _input)