diff --git a/compiler/wasm32/aasmcpu.pas b/compiler/wasm32/aasmcpu.pas
index 0d6670412a..1103fac165 100644
--- a/compiler/wasm32/aasmcpu.pas
+++ b/compiler/wasm32/aasmcpu.pas
@@ -1430,6 +1430,8 @@ uses
                         internalerror(2021092007);
                       result:=1+UlebSize(ref^.offset);
                     end;
+                  top_const:
+                    result:=1+UlebSize(val);
                   else
                     internalerror(2021092008);
                 end;
@@ -2199,6 +2201,8 @@ uses
                         internalerror(2021092007);
                       WriteUleb(ref^.offset);
                     end;
+                  top_const:
+                    WriteUleb(val);
                   else
                     internalerror(2021092008);
                 end;