diff --git a/internal/bundler/bundler.go b/internal/bundler/bundler.go
index 0d193c35..3a665c5f 100644
--- a/internal/bundler/bundler.go
+++ b/internal/bundler/bundler.go
@@ -29,7 +29,6 @@ import (
 	"github.com/evanw/esbuild/internal/logger"
 	"github.com/evanw/esbuild/internal/resolver"
 	"github.com/evanw/esbuild/internal/runtime"
-	"github.com/evanw/esbuild/internal/sourcemap"
 	"github.com/evanw/esbuild/internal/xxhash"
 )
 
@@ -43,7 +42,6 @@ const (
 
 type file struct {
 	module     graph.Module
-	sourceMap  *sourcemap.SourceMap
 	pluginData interface{}
 
 	// The minimum number of links in the module graph to get from an entry point
@@ -486,7 +484,7 @@ func parseFile(args parseArgs) {
 		if repr, ok := result.file.module.Repr.(*graph.JSRepr); ok && repr.AST.SourceMapComment.Text != "" {
 			if path, contents := extractSourceMapFromComment(args.log, args.fs, &args.caches.FSCache,
 				args.res, &source, repr.AST.SourceMapComment, absResolveDir); contents != nil {
-				result.file.sourceMap = js_parser.ParseSourceMap(args.log, logger.Source{
+				result.file.module.InputSourceMap = js_parser.ParseSourceMap(args.log, logger.Source{
 					KeyPath:    path,
 					PrettyPath: args.res.PrettyPath(path),
 					Contents:   *contents,
@@ -2042,7 +2040,7 @@ func (b *Bundle) computeDataForSourceMapsInParallel(options *config.Options, rea
 				go func(sourceIndex uint32, f *file, repr *graph.JSRepr) {
 					result := &results[sourceIndex]
 					result.lineOffsetTables = js_printer.GenerateLineOffsetTables(f.module.Source.Contents, repr.AST.ApproximateLineCount)
-					sm := f.sourceMap
+					sm := f.module.InputSourceMap
 					if !options.ExcludeSourcesContent {
 						if sm == nil {
 							// Simple case: no nested source map
diff --git a/internal/bundler/linker.go b/internal/bundler/linker.go
index 2797674a..2c6db27b 100644
--- a/internal/bundler/linker.go
+++ b/internal/bundler/linker.go
@@ -3633,7 +3633,7 @@ func (c *linkerContext) generateCodeForFileInChunkJS(
 	var lineOffsetTables []js_printer.LineOffsetTable
 	if file.module.Loader.CanHaveSourceMap() && c.options.SourceMap != config.SourceMapNone {
 		addSourceMappings = true
-		inputSourceMap = file.sourceMap
+		inputSourceMap = file.module.InputSourceMap
 		lineOffsetTables = dataForSourceMaps[partRange.sourceIndex].lineOffsetTables
 	}
 
@@ -5041,7 +5041,7 @@ func (c *linkerContext) generateSourceMapForChunk(
 		file := &c.files[result.sourceIndex]
 
 		// Simple case: no nested source map
-		if file.sourceMap == nil {
+		if file.module.InputSourceMap == nil {
 			var quotedContents []byte
 			if !c.options.ExcludeSourcesContent {
 				quotedContents = dataForSourceMaps[result.sourceIndex].quotedContents[0]
@@ -5056,7 +5056,7 @@ func (c *linkerContext) generateSourceMapForChunk(
 		}
 
 		// Complex case: nested source map
-		sm := file.sourceMap
+		sm := file.module.InputSourceMap
 		for i, source := range sm.Sources {
 			path := logger.Path{
 				Namespace: file.module.Source.KeyPath.Namespace,
diff --git a/internal/graph/module.go b/internal/graph/module.go
index ae15eea2..fc8a5f4f 100644
--- a/internal/graph/module.go
+++ b/internal/graph/module.go
@@ -7,13 +7,15 @@ import (
 	"github.com/evanw/esbuild/internal/js_ast"
 	"github.com/evanw/esbuild/internal/logger"
 	"github.com/evanw/esbuild/internal/resolver"
+	"github.com/evanw/esbuild/internal/sourcemap"
 )
 
 type Module struct {
-	Source      logger.Source
-	Repr        ModuleRepr
-	Loader      config.Loader
-	SideEffects SideEffects
+	Source         logger.Source
+	Repr           ModuleRepr
+	Loader         config.Loader
+	SideEffects    SideEffects
+	InputSourceMap *sourcemap.SourceMap
 
 	// If this file ends up being used in the bundle, these are additional files
 	// that must be written to the output directory. It's used by the "file"