diff --git a/source/blender/compositor/realtime_compositor/algorithms/intern/summed_area_table.cc b/source/blender/compositor/realtime_compositor/algorithms/intern/summed_area_table.cc
index d86609b0b0b..8700f6a0007 100644
--- a/source/blender/compositor/realtime_compositor/algorithms/intern/summed_area_table.cc
+++ b/source/blender/compositor/realtime_compositor/algorithms/intern/summed_area_table.cc
@@ -159,6 +159,9 @@ static const char *get_compute_complete_blocks_shader(SummedAreaTableOperation o
     case SummedAreaTableOperation::Square:
       return "compositor_summed_area_table_compute_complete_blocks_square";
   }
+
+  BLI_assert_unreachable();
+  return "";
 }
 
 /* Computes the final summed area table blocks from the complete X and Y prologues using equation