diff --git a/caddyconfig/httpcaddyfile/builtins.go b/caddyconfig/httpcaddyfile/builtins.go
index 4cc453e9..2bb9b907 100644
--- a/caddyconfig/httpcaddyfile/builtins.go
+++ b/caddyconfig/httpcaddyfile/builtins.go
@@ -469,6 +469,11 @@ func parseHandleErrors(h Helper) ([]ConfigValue, error) {
 func parseLog(h Helper) ([]ConfigValue, error) {
 	var configValues []ConfigValue
 	for h.Next() {
+		// log does not currently support any arguments
+		if h.NextArg() {
+			return nil, h.ArgErr()
+		}
+
 		cl := new(caddy.CustomLog)
 
 		for h.NextBlock(0) {
diff --git a/caddyconfig/httpcaddyfile/builtins_test.go b/caddyconfig/httpcaddyfile/builtins_test.go
new file mode 100644
index 00000000..a255538c
--- /dev/null
+++ b/caddyconfig/httpcaddyfile/builtins_test.go
@@ -0,0 +1,62 @@
+package httpcaddyfile
+
+import (
+	"testing"
+
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+	_ "github.com/caddyserver/caddy/v2/modules/logging"
+)
+
+func TestLogDirectiveSyntax(t *testing.T) {
+	for i, tc := range []struct {
+		input       string
+		expectWarn  bool
+		expectError bool
+	}{
+		{
+			input: `:8080 {
+				log
+			}
+			`,
+			expectWarn:  false,
+			expectError: false,
+		},
+		{
+			input: `:8080 {
+				log {
+					output file foo.log
+				}
+			}
+			`,
+			expectWarn:  false,
+			expectError: false,
+		},
+		{
+			input: `:8080 {
+				log /foo {
+					output file foo.log
+				}
+			}
+			`,
+			expectWarn:  false,
+			expectError: true,
+		},
+	} {
+
+		adapter := caddyfile.Adapter{
+			ServerType: ServerType{},
+		}
+
+		_, warnings, err := adapter.Adapt([]byte(tc.input), nil)
+
+		if len(warnings) > 0 != tc.expectWarn {
+			t.Errorf("Test %d warning expectation failed Expected: %v, got %v", i, tc.expectWarn, warnings)
+			continue
+		}
+
+		if err != nil != tc.expectError {
+			t.Errorf("Test %d error expectation failed Expected: %v, got %s", i, tc.expectError, err)
+			continue
+		}
+	}
+}