diff --git a/src/callbacks_step/analysis_surface_integral_2d.jl b/src/callbacks_step/analysis_surface_integral_2d.jl
index 7c61a9cc616..e22d8b14e94 100644
--- a/src/callbacks_step/analysis_surface_integral_2d.jl
+++ b/src/callbacks_step/analysis_surface_integral_2d.jl
@@ -10,7 +10,7 @@
 
 """
     AnalysisSurfaceIntegral{Variable, NBoundaries}(semi,
-                                                   boundary_symbol_or_boundary_symbols,
+                                                   boundary_symbols::NTuple{NBoundaries, Symbol},
                                                    variable)
 
 This struct is used to compute the surface integral of a quantity of interest `variable` alongside