diff --git a/generator/generator.go b/generator/generator.go
index 6104ef451..2e6ad349d 100644
--- a/generator/generator.go
+++ b/generator/generator.go
@@ -10,7 +10,6 @@ import (
 	"runtime/debug"
 	"strings"
 
-	"github.com/a-h/templ"
 	"github.com/a-h/templ/parser/v2"
 )
 
@@ -188,8 +187,8 @@ func (g *generator) writeCSS(n parser.CSSTemplate) error {
 		for i := 0; i < len(n.Properties); i++ {
 			switch p := n.Properties[i].(type) {
 			case parser.ConstantCSSProperty:
-				// Carry out sanitization at compile time for constants.
-				if _, err = g.w.WriteIndent(indentLevel, fmt.Sprintf("templCSSBuilder.WriteString(`%s`)\n", templ.SanitizeCSS(p.Name, p.Value))); err != nil {
+				// Constant CSS property values are not sanitized.
+				if _, err = g.w.WriteIndent(indentLevel, "templCSSBuilder.WriteString("+createGoString(p.String(true))+")\n"); err != nil {
 					return err
 				}
 			case parser.ExpressionCSSProperty:
diff --git a/generator/test-css-expression/render_test.go b/generator/test-css-expression/render_test.go
index 221a5371e..0214889e1 100644
--- a/generator/test-css-expression/render_test.go
+++ b/generator/test-css-expression/render_test.go
@@ -8,8 +8,8 @@ import (
 )
 
 var expected = templ.ComponentCSSClass{
-	ID:    "className_f179",
-	Class: templ.SafeCSS(`.className_f179{background-color:#ffffff;color:#ff0000;}`),
+	ID:    "className_34fc",
+	Class: templ.SafeCSS(`.className_34fc{background-color:#ffffff;max-height:calc(100vh - 170px);color:#ff0000;}`),
 }
 
 func TestCSSExpression(t *testing.T) {
diff --git a/generator/test-css-expression/template.templ b/generator/test-css-expression/template.templ
index eadc889fe..5a6374fa4 100644
--- a/generator/test-css-expression/template.templ
+++ b/generator/test-css-expression/template.templ
@@ -2,6 +2,7 @@ package testcssexpression
 
 css className() {
 	background-color: #ffffff;
+	max-height: calc(100vh - 170px);
 	color: { red };
 }
 
diff --git a/generator/test-css-expression/template_templ.go b/generator/test-css-expression/template_templ.go
index 221eedb8b..132c1abe1 100644
--- a/generator/test-css-expression/template_templ.go
+++ b/generator/test-css-expression/template_templ.go
@@ -10,6 +10,7 @@ import "strings"
 func className() templ.CSSClass {
 	var templCSSBuilder strings.Builder
 	templCSSBuilder.WriteString(`background-color:#ffffff;`)
+	templCSSBuilder.WriteString(`max-height:calc(100vh - 170px);`)
 	templCSSBuilder.WriteString(string(templ.SanitizeCSS(`color`, red)))
 	templCSSID := templ.CSSID(`className`, templCSSBuilder.String())
 	return templ.ComponentCSSClass{
diff --git a/parser/v2/types.go b/parser/v2/types.go
index 2a91268bb..7f6bcff5d 100644
--- a/parser/v2/types.go
+++ b/parser/v2/types.go
@@ -219,11 +219,26 @@ type ConstantCSSProperty struct {
 
 func (c ConstantCSSProperty) IsCSSProperty() bool { return true }
 func (c ConstantCSSProperty) Write(w io.Writer, indent int) error {
-	if err := writeIndent(w, indent, c.Name+": "+c.Value+";\n"); err != nil {
+	if err := writeIndent(w, indent, c.String(false)); err != nil {
 		return err
 	}
 	return nil
 }
+func (c ConstantCSSProperty) String(minified bool) string {
+	var sb strings.Builder
+	sb.WriteString(c.Name)
+	if minified {
+		sb.WriteString(":")
+	} else {
+		sb.WriteString(": ")
+	}
+	sb.WriteString(c.Value)
+	sb.WriteString(";")
+	if !minified {
+		sb.WriteString("\n")
+	}
+	return sb.String()
+}
 
 // background-color: { constants.BackgroundColor };
 type ExpressionCSSProperty struct {