diff --git a/dockerimg/dockerimg.go b/dockerimg/dockerimg.go
index 0759b22..cd0906f 100644
--- a/dockerimg/dockerimg.go
+++ b/dockerimg/dockerimg.go
@@ -115,6 +115,9 @@
 
 	// Outtie's HTTP server
 	OutsideHTTP string
+
+	// Prefix for git branches created by sketch
+	BranchPrefix string
 }
 
 // LaunchContainer creates a docker container for a project, installs sketch and opens a connection to it.
@@ -541,6 +544,7 @@
 		"-termui="+fmt.Sprintf("%t", config.TermUI),
 		"-verbose="+fmt.Sprintf("%t", config.Verbose),
 		"-x="+config.ExperimentFlag,
+		"-branch-prefix="+config.BranchPrefix,
 	)
 	if config.Model != "" {
 		cmdArgs = append(cmdArgs, "-model="+config.Model)