diff --git a/test/libsolidity/AnalysisFramework.cpp b/test/libsolidity/AnalysisFramework.cpp
index a55ed68c9..a88c14581 100644
--- a/test/libsolidity/AnalysisFramework.cpp
+++ b/test/libsolidity/AnalysisFramework.cpp
@@ -51,9 +51,11 @@ AnalysisFramework::parseAnalyseAndReturnError(
 )
 {
 	compiler().reset();
+	// Do not insert license if it is already present.
+	bool insertLicense = _insertLicenseAndVersionPragma && _source.find("// SPDX-License-Identifier:") == string::npos;
 	compiler().setSources({{"",
-		_insertLicenseAndVersionPragma ?
-		"pragma solidity >=0.0;\n// SPDX-License-Identifier: GPL-3.0\n" + _source :
+		string{_insertLicenseAndVersionPragma ? "pragma solidity >=0.0;\n" : ""} +
+		string{insertLicense ? "// SPDX-License-Identifier: GPL-3.0\n" : ""} +
 		_source
 	}});
 	compiler().setEVMVersion(solidity::test::CommonOptions::get().evmVersion());
diff --git a/test/libsolidity/SolidityExecutionFramework.cpp b/test/libsolidity/SolidityExecutionFramework.cpp
index d46ce0dfd..366273faf 100644
--- a/test/libsolidity/SolidityExecutionFramework.cpp
+++ b/test/libsolidity/SolidityExecutionFramework.cpp
@@ -132,7 +132,9 @@ bytes SolidityExecutionFramework::compileContract(
 string SolidityExecutionFramework::addPreamble(string const& _sourceCode)
 {
 	// Silence compiler version warning
-	string preamble = "pragma solidity >=0.0;\n// SPDX-License-Identifier: unlicensed\n";
+	string preamble = "pragma solidity >=0.0;\n";
+	if (_sourceCode.find("// SPDX-License-Identifier:") == string::npos)
+		preamble += "// SPDX-License-Identifier: unlicensed\n";
 	if (
 		solidity::test::CommonOptions::get().useABIEncoderV2 &&
 		_sourceCode.find("pragma experimental ABIEncoderV2;") == string::npos &&