diff --git a/src/Diagnostics/DiagnosticsHolder.cpp b/src/Diagnostics/DiagnosticsHolder.cpp
index 41c245e..0139081 100644
--- a/src/Diagnostics/DiagnosticsHolder.cpp
+++ b/src/Diagnostics/DiagnosticsHolder.cpp
@@ -103,7 +103,7 @@ std::string DiagnosticsHolder::GetFullErrorMessage(Diagnostic diagnostic) {
     auto startPos = diagnostic.GetStartPosition();
     auto line = this -> GetLineFromPosition(startPos);
     auto linePos = startPos - this ->GetStartPositionForLine(line);
-    stream << " (" << line << ", " << linePos << ") ";
+    stream << " (" << line + 1 << ", " << linePos + 1 << ") ";
     auto unformatted = ErrorMessages.find(diagnostic.GetCode());
     if (unformatted != ErrorMessages.end()){
         stream << PrettyDiagnostic(unformatted->second, diagnostic.GetArguments());
diff --git a/src/Parser/Lexer.cpp b/src/Parser/Lexer.cpp
index 3773bbb..39b5b8d 100644
--- a/src/Parser/Lexer.cpp
+++ b/src/Parser/Lexer.cpp
@@ -304,9 +304,9 @@ namespace Porygon::Parser {
                 if (ControlCharacters.find(c) != ControlCharacters.end()) {
                     stream << ControlCharacters.at(c);
                 } else {
-                    auto v = string(1, c).c_str();
+                    auto v = ("\\" + string(1, c)).c_str();
                     this->ScriptData->Diagnostics->LogError(Diagnostics::DiagnosticCode::InvalidStringControlCharacter,
-                                                            start + 1 + i, 1, {v});
+                                                            start + i, 2, {v});
                     stream << c;
                 }
             } else {
diff --git a/tests/integration/DiagnosticsTests.cpp b/tests/integration/DiagnosticsTests.cpp
index 1ed9e31..11c79e5 100644
--- a/tests/integration/DiagnosticsTests.cpp
+++ b/tests/integration/DiagnosticsTests.cpp
@@ -48,7 +48,7 @@ TEST_CASE( "Get full diagnostic message", "[integration]" ) {
     REQUIRE(script->Diagnostics -> HasErrors());
     auto diags = script->Diagnostics -> GetDiagnostics();
     auto msg = script -> Diagnostics -> GetFullErrorMessage(diags[0]);
-    REQUIRE(msg == "[Error]  (1, 2) 'x' is not a valid control character.");
+    REQUIRE(msg == "[Error]  (2, 2) '\\x' is not a valid control character.");
     delete script;
 }