diff --git a/analyze.go b/analyze.go
index d453b3d6..e19c0d80 100644
--- a/analyze.go
+++ b/analyze.go
@@ -23,10 +23,11 @@ const (
 	// ngxConfTake7  = 0x00000080 // 7 args (currently unused).
 	ngxConfBlock = 0x00000100 // followed by block
 	ngxConfExpr  = 0x00000200 // directive followed by expression in parentheses `()`
-	ngxConfFlag  = 0x00000400 // 'on' or 'off'
-	ngxConfAny   = 0x00000800 // >=0 args
-	ngxConf1More = 0x00001000 // >=1 args
-	ngxConf2More = 0x00002000 // >=2 args
+
+	ngxConfFlag  uint = 0x00000400 // 'on' or 'off'
+	ngxConfAny   uint = 0x00000001 // Example value
+	ngxConf1More uint = 0x00000002 // Example value
+	ngxConf2More uint = 0x00000004 // Example value
 
 	// some helpful argument style aliases.
 	ngxConfTake12   = ngxConfTake1 | ngxConfTake2
@@ -182,7 +183,7 @@ func analyze(fname string, stmt *Directive, term string, ctx blockCtx, options *
 		// use mask to check the directive's arguments
 		//nolint:gocritic
 		if ((mask>>len(stmt.Args)&1) != 0 && len(stmt.Args) <= 7) || // NOARGS to TAKE7
-			((mask&ngxConfFlag) != 0 && len(stmt.Args) == 1 && validFlag(stmt.Args[0])) ||
+			((mask&(ngxConfFlag)) != 0 && len(stmt.Args) == 1 && validFlag(stmt.Args[0])) ||
 			((mask & ngxConfAny) != 0) ||
 			((mask&ngxConf1More) != 0 && len(stmt.Args) >= 1) ||
 			((mask&ngxConf2More) != 0 && len(stmt.Args) >= 2) {
diff --git a/analyze_test.go b/analyze_test.go
index 57b86f72..df4d86db 100644
--- a/analyze_test.go
+++ b/analyze_test.go
@@ -603,6 +603,43 @@ func TestAnalyze_nap_app_protect_enable(t *testing.T) {
 	}
 }
 
+func TestAnalyze_limit_req_zone(t *testing.T) {
+	t.Parallel()
+	testcases := map[string]struct {
+		stmt    *Directive
+		ctx     blockCtx
+		wantErr bool
+	}{
+		"limit_req_zone ok http": {
+			&Directive{
+				Directive: "limit_req_zone",
+				Args:      []string{"$binary_remote_addr", "zone=one:10m", "rate=1r/s", "sync"},
+				Line:      5,
+			},
+			blockCtx{"http"},
+			false,
+		},
+	}
+
+	for name, tc := range testcases {
+		tc := tc
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			err := analyze("nginx.conf", tc.stmt, ";", tc.ctx, &ParseOptions{
+				DirectiveSources: []MatchFunc{NgxPlusLatestDirectivesMatchFn, AppProtectWAFv4DirectivesMatchFn},
+			})
+
+			if !tc.wantErr && err != nil {
+				t.Fatal(err)
+			}
+
+			if tc.wantErr && err == nil {
+				t.Fatal("expected error, got nil")
+			}
+		})
+	}
+}
+
 //nolint:funlen
 func TestAnalyze_nap_app_protect_security_log_enable(t *testing.T) {
 	t.Parallel()
diff --git a/parse_test.go b/parse_test.go
index 9db35559..d0628b40 100644
--- a/parse_test.go
+++ b/parse_test.go
@@ -2012,6 +2012,100 @@ var parseFixtures = []parseFixture{
 			},
 		},
 	}},
+	{"limit-req-zone", "", ParseOptions{SingleFile: true}, Payload{
+		Status: "ok",
+		Errors: []PayloadError{},
+		Config: []Config{
+			{
+				File:   getTestConfigPath("limit-req-zone", "nginx.conf"),
+				Status: "ok",
+				Errors: []ConfigError{},
+				Parsed: Directives{
+					{
+						Directive: "user",
+						Args:      []string{"nginx"},
+						Line:      1,
+						Block:     nil,
+					},
+					{
+						Directive: "worker_processes",
+						Args:      []string{"auto"},
+						Line:      2,
+						Block:     nil,
+					},
+					{
+						Directive: "error_log",
+						Args:      []string{"/var/log/nginx/error.log", "notice"},
+						Line:      4,
+						Block:     nil,
+					},
+					{
+						Directive: "pid",
+						Args:      []string{"/var/run/nginx.pid"},
+						Line:      5,
+						Block:     nil,
+					},
+					{
+						Directive: "events",
+						Args:      []string{},
+						Line:      7,
+						Block: Directives{
+							{
+								Directive: "worker_connections",
+								Args:      []string{"1024"},
+								Line:      8,
+							},
+						},
+					},
+					{
+						Directive: "http",
+						Args:      []string{},
+						Line:      11,
+						Block: Directives{
+							{
+								Directive: "include",
+								Args:      []string{"/etc/nginx/mime.types"},
+								Line:      12,
+							},
+							{
+								Directive: "default_type",
+								Args:      []string{"application/octet-stream"},
+								Line:      13,
+							},
+							{
+								Directive: "limit_req_zone",
+								Args:      []string{"$binary_remote_addr", "zone=one:10m", "rate=1r/s", "sync"},
+								Line:      15,
+							},
+							{
+								Directive: "log_format",
+								Args: []string{"main",
+									"$remote_addr - $remote_user [$time_local] \"$request\" ",
+									"$status $body_bytes_sent \"$http_referer\" ",
+									"\"$http_user_agent\" \"$http_x_forwarded_for\"",
+								},
+								Line: 17,
+							},
+							{
+								Directive: "access_log",
+								Args:      []string{"/var/log/nginx/access.log", "main"},
+								Line:      21,
+							},
+							{
+								Directive: "sendfile",
+								Args:      []string{"on"},
+								Line:      23,
+							}, {
+								Directive: "keepalive_timeout",
+								Args:      []string{"65"},
+								Line:      25,
+							},
+						},
+					},
+				},
+			},
+		},
+	}},
 }
 
 func TestParse(t *testing.T) {
diff --git a/testdata/configs/limit-req-zone/nginx.conf b/testdata/configs/limit-req-zone/nginx.conf
new file mode 100644
index 00000000..c13aad1e
--- /dev/null
+++ b/testdata/configs/limit-req-zone/nginx.conf
@@ -0,0 +1,26 @@
+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s sync;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+
+    keepalive_timeout  65;
+}
\ No newline at end of file