diff --git a/configfile.go b/configfile.go
index 27e20e9..48d1316 100644
--- a/configfile.go
+++ b/configfile.go
@@ -144,7 +144,7 @@ func loadConfigFile(in io.Reader) (*configFile, error) {
 
 func (c *configFile) GenerateCommand(argv []string, time string) (commandLine []string, env []string, err error) {
 	var (
-		tmpArg, tmpEnv     []string
+		tmpEnv             []string
 		option, root, dest string
 		addTime            bool
 		command            = argv[0]
@@ -208,25 +208,19 @@ func (c *configFile) GenerateCommand(argv []string, time string) (commandLine []
 	tmpEnv = c.generateCredentialExport()
 	env = append(env, tmpEnv...)
 
-	// Clean empty entries from the list
-	tmpArg = []string{}
-	tmpEnv = []string{}
+	commandLine = c.cleanSlice(commandLine)
+	env = c.cleanSlice(env)
 
-	for _, i := range commandLine {
+	return
+}
+
+func (c *configFile) cleanSlice(in []string) (out []string) {
+	for _, i := range in {
 		if i != "" {
-			tmpArg = append(tmpArg, i)
+			out = append(out, i)
 		}
 	}
 
-	for _, i := range env {
-		if i != "" {
-			tmpEnv = append(tmpEnv, i)
-		}
-	}
-
-	commandLine = tmpArg
-	env = tmpEnv
-
 	return
 }
 
diff --git a/configfile_test.go b/configfile_test.go
index c97d013..d5c6c9e 100644
--- a/configfile_test.go
+++ b/configfile_test.go
@@ -71,6 +71,64 @@ logdir: /var/log/duplicity/
 		})
 	})
 
+	Context("Incremental backup with given config", func() {
+		BeforeEach(func() {
+			argv = []string{"incr"}
+		})
+
+		It("should not have errored", func() {
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("should have exported secrets in ENV variables", func() {
+			Expect(env).To(Equal([]string{
+				"PASSPHRASE=5pJZqnzrmFSi1wqZtcUh",
+				"AWS_ACCESS_KEY_ID=AKIAJKCC13246798732A",
+				"AWS_SECRET_ACCESS_KEY=Oosdkfjadgiuagbiajbgaliurtbjsbfgaldfbgdf",
+			}))
+		})
+
+		It("should have generated the expected commandLine", func() {
+			Expect(commandLine).To(Equal([]string{
+				"incr",
+				"--full-if-older-than", "7D",
+				"--s3-use-new-style",
+				"--include=/data",
+				"--exclude=**",
+				"/", "s3+http://my-backup/myhost/",
+			}))
+		})
+	})
+
+	Context("Forced full backup with given config", func() {
+		BeforeEach(func() {
+			argv = []string{"full"}
+		})
+
+		It("should not have errored", func() {
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("should have exported secrets in ENV variables", func() {
+			Expect(env).To(Equal([]string{
+				"PASSPHRASE=5pJZqnzrmFSi1wqZtcUh",
+				"AWS_ACCESS_KEY_ID=AKIAJKCC13246798732A",
+				"AWS_SECRET_ACCESS_KEY=Oosdkfjadgiuagbiajbgaliurtbjsbfgaldfbgdf",
+			}))
+		})
+
+		It("should have generated the expected commandLine", func() {
+			Expect(commandLine).To(Equal([]string{
+				"full",
+				"--full-if-older-than", "7D",
+				"--s3-use-new-style",
+				"--include=/data",
+				"--exclude=**",
+				"/", "s3+http://my-backup/myhost/",
+			}))
+		})
+	})
+
 	Context("auto-removal with given config", func() {
 		BeforeEach(func() {
 			argv = []string{"__remove_old"}