diff --git a/plugin/caddyfile/merger.go b/plugin/caddyfile/merge.go
similarity index 84%
rename from plugin/caddyfile/merger.go
rename to plugin/caddyfile/merge.go
index 352682ab..a2214eb5 100644
--- a/plugin/caddyfile/merger.go
+++ b/plugin/caddyfile/merge.go
@@ -8,8 +8,8 @@ OuterLoop:
 	for _, blockB := range containerB.Children {
 		firstKey := blockB.GetFirstKey()
 		for _, blockA := range containerA.GetAllByFirstKey(firstKey) {
-			if firstKey == "reverse_proxy" && getMatcher(blockA) == getMatcher(blockB) {
-				mergeReverseProxy(blockA, blockB)
+			if (firstKey == "reverse_proxy" || firstKey == "php_fastcgi") && getMatcher(blockA) == getMatcher(blockB) {
+				mergeReverseProxyLike(blockA, blockB)
 				continue OuterLoop
 			} else if blocksAreEqual(blockA, blockB) {
 				blockA.Container.Merge(blockB.Container)
@@ -20,7 +20,7 @@ OuterLoop:
 	}
 }
 
-func mergeReverseProxy(blockA *Block, blockB *Block) {
+func mergeReverseProxyLike(blockA *Block, blockB *Block) {
 	for index, key := range blockB.Keys[1:] {
 		if index > 0 || !isMatcher(key) {
 			blockA.AddKeys(key)
diff --git a/plugin/caddyfile/merge_test.go b/plugin/caddyfile/merge_test.go
new file mode 100644
index 00000000..00e8deda
--- /dev/null
+++ b/plugin/caddyfile/merge_test.go
@@ -0,0 +1,60 @@
+package caddyfile
+
+import (
+	"io/ioutil"
+	"regexp"
+	"strings"
+	"testing"
+
+	_ "github.com/caddyserver/caddy/v2/modules/standard" // plug standard HTTP modules
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMerge(t *testing.T) {
+	const folder = "./testdata/merge"
+
+	// load the list of test files from the dir
+	files, err := ioutil.ReadDir(folder)
+	if err != nil {
+		t.Errorf("failed to read process dir: %s", err)
+	}
+
+	// prep a regexp to fix strings on windows
+	winNewlines := regexp.MustCompile(`\r?\n`)
+
+	for _, f := range files {
+		if f.IsDir() {
+			continue
+		}
+
+		// read the test file
+		filename := f.Name()
+
+		t.Run(filename, func(t *testing.T) {
+			data, err := ioutil.ReadFile(folder + "/" + filename)
+			if err != nil {
+				t.Errorf("failed to read %s dir: %s", filename, err)
+			}
+
+			// replace windows newlines in the json with unix newlines
+			content := winNewlines.ReplaceAllString(string(data), "\n")
+
+			// split two Caddyfile parts
+			parts := strings.Split(content, "----------\n")
+			caddyfile1, caddyfile2, expectedCaddyfile := parts[0], parts[1], parts[2]
+
+			container1, _ := Unmarshal([]byte(caddyfile1))
+			container2, _ := Unmarshal([]byte(caddyfile2))
+
+			container1.Merge(container2)
+
+			result := string(container1.Marshal())
+
+			actualCaddyfile := string(result)
+
+			// compare the actual and expected Caddyfiles
+			assert.Equal(t, expectedCaddyfile, actualCaddyfile,
+				"failed to process in %s", filename)
+		})
+	}
+}
diff --git a/plugin/caddyfile/testdata/merge/php_fastcgi_different_matcher.txt b/plugin/caddyfile/testdata/merge/php_fastcgi_different_matcher.txt
new file mode 100644
index 00000000..ce23f216
--- /dev/null
+++ b/plugin/caddyfile/testdata/merge/php_fastcgi_different_matcher.txt
@@ -0,0 +1,12 @@
+example.com {
+	php_fastcgi /a service-a:80
+}
+----------
+example.com {
+	php_fastcgi /b service-b:81
+}
+----------
+example.com {
+	php_fastcgi /a service-a:80
+	php_fastcgi /b service-b:81
+}
diff --git a/plugin/caddyfile/testdata/merge/php_fastcgi_no_matcher.txt b/plugin/caddyfile/testdata/merge/php_fastcgi_no_matcher.txt
new file mode 100644
index 00000000..ebf01faa
--- /dev/null
+++ b/plugin/caddyfile/testdata/merge/php_fastcgi_no_matcher.txt
@@ -0,0 +1,11 @@
+example.com {
+	php_fastcgi service-a:80
+}
+----------
+example.com {
+	php_fastcgi service-b:81
+}
+----------
+example.com {
+	php_fastcgi service-a:80 service-b:81
+}
diff --git a/plugin/caddyfile/testdata/merge/php_fastcgi_same_matcher.txt b/plugin/caddyfile/testdata/merge/php_fastcgi_same_matcher.txt
new file mode 100644
index 00000000..2897a801
--- /dev/null
+++ b/plugin/caddyfile/testdata/merge/php_fastcgi_same_matcher.txt
@@ -0,0 +1,11 @@
+example.com {
+	php_fastcgi /path service-a:80
+}
+----------
+example.com {
+	php_fastcgi /path service-b:81
+}
+----------
+example.com {
+	php_fastcgi /path service-a:80 service-b:81
+}
diff --git a/plugin/caddyfile/testdata/merge/reverse_proxy_different_matcher.txt b/plugin/caddyfile/testdata/merge/reverse_proxy_different_matcher.txt
new file mode 100644
index 00000000..84a03b3e
--- /dev/null
+++ b/plugin/caddyfile/testdata/merge/reverse_proxy_different_matcher.txt
@@ -0,0 +1,12 @@
+example.com {
+	reverse_proxy /a service-a:80
+}
+----------
+example.com {
+	reverse_proxy /b service-b:81
+}
+----------
+example.com {
+	reverse_proxy /a service-a:80
+	reverse_proxy /b service-b:81
+}
diff --git a/plugin/caddyfile/testdata/merge/reverse_proxy_no_matcher.txt b/plugin/caddyfile/testdata/merge/reverse_proxy_no_matcher.txt
new file mode 100644
index 00000000..f692b4b3
--- /dev/null
+++ b/plugin/caddyfile/testdata/merge/reverse_proxy_no_matcher.txt
@@ -0,0 +1,11 @@
+example.com {
+	reverse_proxy service-a:80
+}
+----------
+example.com {
+	reverse_proxy service-b:81
+}
+----------
+example.com {
+	reverse_proxy service-a:80 service-b:81
+}
diff --git a/plugin/caddyfile/testdata/merge/reverse_proxy_same_matcher.txt b/plugin/caddyfile/testdata/merge/reverse_proxy_same_matcher.txt
new file mode 100644
index 00000000..fbbcefb5
--- /dev/null
+++ b/plugin/caddyfile/testdata/merge/reverse_proxy_same_matcher.txt
@@ -0,0 +1,11 @@
+example.com {
+	reverse_proxy /path service-a:80
+}
+----------
+example.com {
+	reverse_proxy /path service-b:81
+}
+----------
+example.com {
+	reverse_proxy /path service-a:80 service-b:81
+}