diff --git a/lib/std/Build/Step/Run.zig b/lib/std/Build/Step/Run.zig
index 3d81873308..edb7cbeca4 100644
--- a/lib/std/Build/Step/Run.zig
+++ b/lib/std/Build/Step/Run.zig
@@ -112,12 +112,17 @@ pub const StdIo = union(enum) {
 
 pub const Arg = union(enum) {
     artifact: *Step.Compile,
-    file_source: std.Build.FileSource,
-    directory_source: std.Build.FileSource,
+    file_source: PrefixedFileSource,
+    directory_source: PrefixedFileSource,
     bytes: []u8,
     output: *Output,
 };
 
+pub const PrefixedFileSource = struct {
+    prefix: []const u8,
+    file_source: std.Build.FileSource,
+};
+
 pub const Output = struct {
     generated_file: std.Build.GeneratedFile,
     prefix: []const u8,
@@ -145,9 +150,9 @@ pub fn setName(self: *Run, name: []const u8) void {
     self.rename_step_with_output_arg = false;
 }
 
-pub fn enableTestRunnerMode(rs: *Run) void {
-    rs.stdio = .zig_test;
-    rs.addArgs(&.{"--listen=-"});
+pub fn enableTestRunnerMode(self: *Run) void {
+    self.stdio = .zig_test;
+    self.addArgs(&.{"--listen=-"});
 }
 
 pub fn addArtifactArg(self: *Run, artifact: *Step.Compile) void {
@@ -158,43 +163,59 @@ pub fn addArtifactArg(self: *Run, artifact: *Step.Compile) void {
 /// This provides file path as a command line argument to the command being
 /// run, and returns a FileSource which can be used as inputs to other APIs
 /// throughout the build system.
-pub fn addOutputFileArg(rs: *Run, basename: []const u8) std.Build.FileSource {
-    return addPrefixedOutputFileArg(rs, "", basename);
+pub fn addOutputFileArg(self: *Run, basename: []const u8) std.Build.FileSource {
+    return self.addPrefixedOutputFileArg("", basename);
 }
 
 pub fn addPrefixedOutputFileArg(
-    rs: *Run,
+    self: *Run,
     prefix: []const u8,
     basename: []const u8,
 ) std.Build.FileSource {
-    const b = rs.step.owner;
+    const b = self.step.owner;
 
     const output = b.allocator.create(Output) catch @panic("OOM");
     output.* = .{
         .prefix = prefix,
         .basename = basename,
-        .generated_file = .{ .step = &rs.step },
+        .generated_file = .{ .step = &self.step },
     };
-    rs.argv.append(.{ .output = output }) catch @panic("OOM");
+    self.argv.append(.{ .output = output }) catch @panic("OOM");
 
-    if (rs.rename_step_with_output_arg) {
-        rs.setName(b.fmt("{s} ({s})", .{ rs.step.name, basename }));
+    if (self.rename_step_with_output_arg) {
+        self.setName(b.fmt("{s} ({s})", .{ self.step.name, basename }));
     }
 
     return .{ .generated = &output.generated_file };
 }
 
 pub fn addFileSourceArg(self: *Run, file_source: std.Build.FileSource) void {
-    self.argv.append(.{
-        .file_source = file_source.dupe(self.step.owner),
-    }) catch @panic("OOM");
+    self.addPrefixedFileSourceArg("", file_source);
+}
+
+pub fn addPrefixedFileSourceArg(self: *Run, prefix: []const u8, file_source: std.Build.FileSource) void {
+    const b = self.step.owner;
+
+    const prefixed_file_source: PrefixedFileSource = .{
+        .prefix = b.dupe(prefix),
+        .file_source = file_source.dupe(b),
+    };
+    self.argv.append(.{ .file_source = prefixed_file_source }) catch @panic("OOM");
     file_source.addStepDependencies(&self.step);
 }
 
 pub fn addDirectorySourceArg(self: *Run, directory_source: std.Build.FileSource) void {
-    self.argv.append(.{
-        .directory_source = directory_source.dupe(self.step.owner),
-    }) catch @panic("OOM");
+    self.addPrefixedDirectorySourceArg("", directory_source);
+}
+
+pub fn addPrefixedDirectorySourceArg(self: *Run, prefix: []const u8, directory_source: std.Build.FileSource) void {
+    const b = self.step.owner;
+
+    const prefixed_directory_source: PrefixedFileSource = .{
+        .prefix = b.dupe(prefix),
+        .file_source = directory_source.dupe(b),
+    };
+    self.argv.append(.{ .directory_source = prefixed_directory_source }) catch @panic("OOM");
     directory_source.addStepDependencies(&self.step);
 }
 
@@ -395,13 +416,15 @@ fn make(step: *Step, prog_node: *std.Progress.Node) !void {
                 man.hash.addBytes(bytes);
             },
             .file_source => |file| {
-                const file_path = file.getPath(b);
-                try argv_list.append(file_path);
+                const file_path = file.file_source.getPath(b);
+                try argv_list.append(b.fmt("{s}{s}", .{ file.prefix, file_path }));
+                man.hash.addBytes(file.prefix);
                 _ = try man.addFile(file_path, null);
             },
             .directory_source => |file| {
-                const file_path = file.getPath(b);
-                try argv_list.append(file_path);
+                const file_path = file.file_source.getPath(b);
+                try argv_list.append(b.fmt("{s}{s}", .{ file.prefix, file_path }));
+                man.hash.addBytes(file.prefix);
                 man.hash.addBytes(file_path);
             },
             .artifact => |artifact| {