diff --git a/harness/build.go b/harness/build.go
index cd0d80b..5f6627b 100755
--- a/harness/build.go
+++ b/harness/build.go
@@ -88,8 +88,9 @@ func Build(buildFlags ...string) (app *App, compileError *revel.Error) {
 			revel.ImportPath, appVersion, revel.ImportPath, buildTime)
 
 		// TODO remove version check for versionLinkerFlags after Revel becomes Go min version to go1.5
-		goVersion, _ := strconv.ParseFloat(runtime.Version()[2:5], 64)
-		if goVersion < 1.5 {
+		goVersion, err := strconv.ParseFloat(runtime.Version()[2:5], 64)
+		// runtime.Version() may return commit hash, we assume it is above 1.5
+		if goVersion < 1.5 && err == nil {
 			versionLinkerFlags = fmt.Sprintf("-X %s/app.AppVersion \"%s\" -X %s/app.BuildTime \"%s\"",
 				revel.ImportPath, appVersion, revel.ImportPath, buildTime)
 		}