diff --git a/gexec/build.go b/gexec/build.go
index ce1574d46..741d845f4 100644
--- a/gexec/build.go
+++ b/gexec/build.go
@@ -68,7 +68,7 @@ func doBuild(gopath, packagePath string, env []string, args ...string) (compiled
 
 	executable := filepath.Join(tmpDir, path.Base(packagePath))
 	if runtime.GOOS == "windows" {
-		executable = executable + ".exe"
+		executable += ".exe"
 	}
 
 	cmdArgs := append([]string{"build"}, args...)