diff --git a/pkg/builders/s2i/builder.go b/pkg/builders/s2i/builder.go
index 03b2ac5c7..c7fb5950f 100644
--- a/pkg/builders/s2i/builder.go
+++ b/pkg/builders/s2i/builder.go
@@ -295,7 +295,7 @@ func (b *Builder) Build(ctx context.Context, f fn.Function, platforms []fn.Platf
 				}
 			}
 
-			hdr, err := tar.FileInfoHeader(fi, lnk)
+			hdr, err := tar.FileInfoHeader(fi, filepath.ToSlash(lnk))
 			if err != nil {
 				return fmt.Errorf("cannot create tar header: %w", err)
 			}
diff --git a/pkg/pipelines/tekton/pipelines_provider.go b/pkg/pipelines/tekton/pipelines_provider.go
index 46b08ed38..1c31ecc7d 100644
--- a/pkg/pipelines/tekton/pipelines_provider.go
+++ b/pkg/pipelines/tekton/pipelines_provider.go
@@ -336,7 +336,7 @@ func sourcesAsTarStream(f fn.Function) *io.PipeReader {
 				}
 			}
 
-			hdr, err := tar.FileInfoHeader(fi, lnk)
+			hdr, err := tar.FileInfoHeader(fi, filepath.ToSlash(lnk))
 			if err != nil {
 				return fmt.Errorf("cannot create a tar header: %w", err)
 			}