diff --git a/pkg/config/config.go b/pkg/config/config.go
index b0f4287c0..358f92536 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -39,6 +39,7 @@ import (
 	"github.com/joho/godotenv"
 	"gopkg.in/yaml.v3"
 
+	"chainguard.dev/melange/pkg/container"
 	"chainguard.dev/melange/pkg/util"
 )
 
@@ -971,6 +972,7 @@ func buildConfigMap(cfg *Configuration) map[string]string {
 		SubstitutionPackageDescription: cfg.Package.Description,
 		SubstitutionPackageEpoch:       strconv.FormatUint(cfg.Package.Epoch, 10),
 		SubstitutionPackageFullVersion: fmt.Sprintf("%s-r%d", cfg.Package.Version, cfg.Package.Epoch),
+		SubstitutionPackageSrcdir:      container.DefaultWorkspaceDir,
 	}
 
 	for k, v := range cfg.Vars {
@@ -1378,8 +1380,8 @@ func ParseConfiguration(_ context.Context, configurationFilePath string, opts ..
 	}
 
 	const (
-		defaultEnvVarHOME       = "/home/build"
-		defaultEnvVarGOPATH     = "/home/build/.cache/go"
+		defaultEnvVarHOME       = container.DefaultWorkspaceDir
+		defaultEnvVarGOPATH     = container.DefaultWorkspaceDir + "/.cache/go"
 		defaultEnvVarGOMODCACHE = "/var/cache/melange/gomodcache"
 	)