diff --git a/apps/plasp-app/main.cpp b/apps/plasp-app/main.cpp
index fdebffa..6576d4e 100644
--- a/apps/plasp-app/main.cpp
+++ b/apps/plasp-app/main.cpp
@@ -57,16 +57,12 @@ int main(int argc, char **argv)
 		return EXIT_SUCCESS;
 	}
 
-	if (!variablesMap.count("input"))
-	{
-		std::cerr << "Error: No input file specified" << std::endl << std::endl;
-		printHelp();
-		return EXIT_FAILURE;
-	}
-
 	try
 	{
-		const auto sasDescription = plasp::sas::Description::fromFile(variablesMap["input"].as<std::string>());
+		const auto sasDescription = variablesMap.count("input")
+			? plasp::sas::Description::fromFile(variablesMap["input"].as<std::string>())
+			: plasp::sas::Description::fromStream(std::cin);
+
 		const auto sasTranslator = plasp::sas::TranslatorASP(sasDescription);
 		sasTranslator.translate(std::cout);
 	}