diff --git a/Data Files/Changelog.txt b/Data Files/Changelog.txt
index 376b830b4..c4ae2e218 100644
--- a/Data Files/Changelog.txt	
+++ b/Data Files/Changelog.txt	
@@ -180,4 +180,5 @@ Revision	Log Message
 177		Don't bother mapping wastelands to wastelands
 178		Map CK2 religions to CK2 religion groups
 179		Map CK2 cultures to CK2 culture groups, then disallow wrong culture buildings
-180		Use basetax and manpower proxies to try to break ties in religion conversion
\ No newline at end of file
+180		Use basetax and manpower proxies to try to break ties in religion conversion
+181		Default output filename is again output.eu3
\ No newline at end of file
diff --git a/Source/Convert.cpp b/Source/Convert.cpp
index 961e96523..a57332062 100644
--- a/Source/Convert.cpp
+++ b/Source/Convert.cpp
@@ -312,7 +312,15 @@ int main(int argc, char * argv[])
 	// Output results
 	printf("Outputting save.\n");
 	log("Outputting save.\n");
-	string outputFilename = inputFilename.substr(0, inputFilename.find_last_of('.')) + ".eu3";
+	string outputFilename;
+	if (argc >= 2)
+	{
+		outputFilename = inputFilename.substr(0, inputFilename.find_last_of('.')) + ".eu3";
+	}
+	else
+	{
+		outputFilename = "output.eu3";
+	}
 	FILE* output;
 	if (fopen_s(&output, outputFilename.c_str(), "w") != 0)
 	{