diff --git a/internal/arduino/builder/internal/preprocessor/arduino_preprocessor.go b/internal/arduino/builder/internal/preprocessor/arduino_preprocessor.go
index e991a6f0240..da8cde2adfc 100644
--- a/internal/arduino/builder/internal/preprocessor/arduino_preprocessor.go
+++ b/internal/arduino/builder/internal/preprocessor/arduino_preprocessor.go
@@ -33,11 +33,11 @@ import (
 func PreprocessSketchWithArduinoPreprocessor(
 	sk *sketch.Sketch, buildPath *paths.Path, includeFolders paths.PathList,
 	lineOffset int, buildProperties *properties.Map, onlyUpdateCompilationDatabase bool,
-) (Result, error) {
+) (*Result, error) {
 	verboseOut := &bytes.Buffer{}
 	normalOut := &bytes.Buffer{}
 	if err := buildPath.Join("preproc").MkdirAll(); err != nil {
-		return Result{}, err
+		return nil, err
 	}
 
 	sourceFile := buildPath.Join("sketch", sk.MainFile.Base()+".cpp")
@@ -46,7 +46,7 @@ func PreprocessSketchWithArduinoPreprocessor(
 	verboseOut.Write(gccResult.Stdout())
 	verboseOut.Write(gccResult.Stderr())
 	if err != nil {
-		return Result{}, err
+		return nil, err
 	}
 
 	arduiniPreprocessorProperties := properties.NewMap()
@@ -59,18 +59,18 @@ func PreprocessSketchWithArduinoPreprocessor(
 	arduiniPreprocessorProperties.SetPath("source_file", targetFile)
 	pattern := arduiniPreprocessorProperties.Get("pattern")
 	if pattern == "" {
-		return Result{}, errors.New(tr("arduino-preprocessor pattern is missing"))
+		return nil, errors.New(tr("arduino-preprocessor pattern is missing"))
 	}
 
 	commandLine := arduiniPreprocessorProperties.ExpandPropsInString(pattern)
 	parts, err := properties.SplitQuotedString(commandLine, `"'`, false)
 	if err != nil {
-		return Result{}, err
+		return nil, err
 	}
 
 	command, err := paths.NewProcess(nil, parts...)
 	if err != nil {
-		return Result{}, err
+		return nil, err
 	}
 	if runtime.GOOS == "windows" {
 		// chdir in the uppermost directory to avoid UTF-8 bug in clang (https://github.com/arduino/arduino-preprocessor/issues/2)
@@ -81,13 +81,13 @@ func PreprocessSketchWithArduinoPreprocessor(
 	commandStdOut, commandStdErr, err := command.RunAndCaptureOutput(context.Background())
 	verboseOut.Write(commandStdErr)
 	if err != nil {
-		return Result{args: gccResult.Args(), stdout: verboseOut.Bytes(), stderr: normalOut.Bytes()}, err
+		return &Result{args: gccResult.Args(), stdout: verboseOut.Bytes(), stderr: normalOut.Bytes()}, err
 	}
 	result := utils.NormalizeUTF8(commandStdOut)
 
 	destFile := buildPath.Join(sk.MainFile.Base() + ".cpp")
 	if err := destFile.WriteFile(result); err != nil {
-		return Result{args: gccResult.Args(), stdout: verboseOut.Bytes(), stderr: normalOut.Bytes()}, err
+		return &Result{args: gccResult.Args(), stdout: verboseOut.Bytes(), stderr: normalOut.Bytes()}, err
 	}
-	return Result{args: gccResult.Args(), stdout: verboseOut.Bytes(), stderr: normalOut.Bytes()}, err
+	return &Result{args: gccResult.Args(), stdout: verboseOut.Bytes(), stderr: normalOut.Bytes()}, err
 }
diff --git a/internal/arduino/builder/internal/preprocessor/ctags.go b/internal/arduino/builder/internal/preprocessor/ctags.go
index 5ddbbecde52..c9484593c74 100644
--- a/internal/arduino/builder/internal/preprocessor/ctags.go
+++ b/internal/arduino/builder/internal/preprocessor/ctags.go
@@ -43,11 +43,11 @@ var DebugPreprocessor bool
 func PreprocessSketchWithCtags(
 	sketch *sketch.Sketch, buildPath *paths.Path, includes paths.PathList,
 	lineOffset int, buildProperties *properties.Map, onlyUpdateCompilationDatabase bool,
-) (Result, error) {
+) (*Result, error) {
 	// Create a temporary working directory
 	tmpDir, err := paths.MkTempDir("", "")
 	if err != nil {
-		return Result{}, err
+		return nil, err
 	}
 	defer tmpDir.RemoveAll()
 	ctagsTarget := tmpDir.Join("sketch_merged.cpp")
@@ -61,7 +61,7 @@ func PreprocessSketchWithCtags(
 	stderr.Write(result.Stderr())
 	if err != nil {
 		if !onlyUpdateCompilationDatabase {
-			return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+			return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 		}
 
 		// Do not bail out if we are generating the compile commands database
@@ -69,24 +69,24 @@ func PreprocessSketchWithCtags(
 			tr("An error occurred adding prototypes"),
 			tr("the compilation database may be incomplete or inaccurate")))
 		if err := sourceFile.CopyTo(ctagsTarget); err != nil {
-			return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+			return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 		}
 	}
 
 	if src, err := ctagsTarget.ReadFile(); err == nil {
 		filteredSource := filterSketchSource(sketch, bytes.NewReader(src), false)
 		if err := ctagsTarget.WriteFile([]byte(filteredSource)); err != nil {
-			return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+			return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 		}
 	} else {
-		return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+		return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 	}
 
 	// Run CTags on gcc-preprocessed source
 	ctagsOutput, ctagsStdErr, err := RunCTags(ctagsTarget, buildProperties)
 	stderr.Write(ctagsStdErr)
 	if err != nil {
-		return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+		return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 	}
 
 	// Parse CTags output
@@ -101,13 +101,13 @@ func PreprocessSketchWithCtags(
 	if sourceData, err := sourceFile.ReadFile(); err == nil {
 		source = string(sourceData)
 	} else {
-		return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+		return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 	}
 	source = strings.ReplaceAll(source, "\r\n", "\n")
 	source = strings.ReplaceAll(source, "\r", "\n")
 	sourceRows := strings.Split(source, "\n")
 	if isFirstFunctionOutsideOfSource(firstFunctionLine, sourceRows) {
-		return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, nil
+		return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, nil
 	}
 
 	insertionLine := firstFunctionLine + lineOffset - 1
@@ -133,7 +133,7 @@ func PreprocessSketchWithCtags(
 
 	// Write back arduino-preprocess output to the sourceFile
 	err = sourceFile.WriteFile([]byte(preprocessedSource))
-	return Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
+	return &Result{args: result.Args(), stdout: stdout.Bytes(), stderr: stderr.Bytes()}, err
 }
 
 func composePrototypeSection(line int, prototypes []*ctags.Prototype) string {
diff --git a/internal/arduino/builder/preprocess_sketch.go b/internal/arduino/builder/preprocess_sketch.go
index 975861c135b..4be17eaaf47 100644
--- a/internal/arduino/builder/preprocess_sketch.go
+++ b/internal/arduino/builder/preprocess_sketch.go
@@ -27,11 +27,13 @@ func (b *Builder) preprocessSketch(includes paths.PathList) error {
 		b.sketch, b.buildPath, includes, b.lineOffset,
 		b.buildProperties, b.onlyUpdateCompilationDatabase,
 	)
-	if b.logger.Verbose() {
-		b.logger.WriteStdout(result.Stdout())
+	if result != nil {
+		if b.logger.Verbose() {
+			b.logger.WriteStdout(result.Stdout())
+		}
+		b.logger.WriteStdout(result.Stderr())
+		b.diagnosticStore.Parse(result.Args(), result.Stderr())
 	}
-	b.logger.WriteStdout(result.Stderr())
-	b.diagnosticStore.Parse(result.Args(), result.Stderr())
 
 	return err
 }