diff --git a/bindings/vapi/javascriptcore-4.0.vapi b/bindings/vapi/javascriptcore-4.0.vapi
index 430c353d..fd64630d 100644
--- a/bindings/vapi/javascriptcore-4.0.vapi
+++ b/bindings/vapi/javascriptcore-4.0.vapi
@@ -8,10 +8,10 @@ namespace JS {
 	public struct GlobalContext {
 
         [CCode (cname = "JSValueIsNumber")]
-        public bool isNumber(JS.Value value);
+        public bool is_number(JS.Value value);
 
         [CCode (cname = "JSValueToNumber")]
-        public double toNumber(JS.Value value, out JS.Value err);
+        public double to_number(JS.Value value, out JS.Value exception);
 
 	}
 
diff --git a/src/client/components/client-web-view.vala b/src/client/components/client-web-view.vala
index ba67d2b8..98cb5fb5 100644
--- a/src/client/components/client-web-view.vala
+++ b/src/client/components/client-web-view.vala
@@ -78,11 +78,11 @@ public class ClientWebView : WebKit.WebView {
         throws JSError {
         JS.GlobalContext context = result.get_global_context();
         JS.Value value = result.get_value();
-        if (!context.isNumber(value)) {
+        if (!context.is_number(value)) {
             throw new JSError.TYPE("Value is not a number");
         }
         JS.Value? err = null;
-        return (int) context.toNumber(value, out err);
+        return (int) context.to_number(value, out err);
     }
 
     private static inline uint to_wk2_font_size(Pango.FontDescription font) {