diff --git a/api/graphics_impl_lib.C b/api/graphics_impl_lib.C
index d8ffabb59a..8f1acdb416 100644
--- a/api/graphics_impl_lib.C
+++ b/api/graphics_impl_lib.C
@@ -27,8 +27,8 @@ int boinc_get_init_data(APP_INIT_DATA& app_init_data) {
     return g_bmsp->boinc_get_init_data_hook(app_init_data);
 }
 
-int boinc_is_standalone() {
-    return g_bmsp->boinc_is_standalone_hook());
+bool boinc_is_standalone() {
+    return g_bmsp->boinc_is_standalone_hook();
 }
 
 #ifdef __GNUC__