diff --git a/core/src/commonMain/kotlin/ca/gosyer/jui/core/lang/String.kt b/core/src/commonMain/kotlin/ca/gosyer/jui/core/lang/String.kt
index 0dcbe5c7..71fbe5f1 100644
--- a/core/src/commonMain/kotlin/ca/gosyer/jui/core/lang/String.kt
+++ b/core/src/commonMain/kotlin/ca/gosyer/jui/core/lang/String.kt
@@ -20,6 +20,8 @@ fun String.chop(count: Int, replacement: String = "…"): String {
     }
 }
 
+expect fun String.capitalize(locale: Locale = Locale.current): String
+
 expect fun String.uppercase(locale: Locale): String
 
 expect fun String.lowercase(locale: Locale): String
diff --git a/core/src/jvmMain/kotlin/ca/gosyer/jui/core/lang/JvmString.kt b/core/src/jvmMain/kotlin/ca/gosyer/jui/core/lang/JvmString.kt
index 0113b3f9..28d33f30 100644
--- a/core/src/jvmMain/kotlin/ca/gosyer/jui/core/lang/JvmString.kt
+++ b/core/src/jvmMain/kotlin/ca/gosyer/jui/core/lang/JvmString.kt
@@ -9,7 +9,7 @@ package ca.gosyer.jui.core.lang
 
 import androidx.compose.ui.text.intl.Locale
 
-fun String.capitalize(locale: Locale = Locale.current) =
+actual fun String.capitalize(locale: Locale) =
     replaceFirstChar { if (it.isLowerCase()) it.titlecase(locale) else it.toString() }
 
 actual fun String.uppercase(locale: Locale): String = uppercase(locale.toPlatform())