1 files changed, 10 insertions, 0 deletions
diff --git a/source/luametatex/source/tex/texconditional.c b/source/luametatex/source/tex/texconditional.c
index 95035f43e..b25bdfbbe 100644
--- a/source/luametatex/source/tex/texconditional.c
+++ b/source/luametatex/source/tex/texconditional.c
@@ -506,6 +506,11 @@ void tex_conditional_if(halfword code, int unless)
                 }
             }
             goto RESULT;
+        case if_zero_int_code:
+            {
+                result = tex_scan_int(0, NULL) == 0;
+            }
+            goto RESULT;
         case if_abs_dim_code:
         case if_dim_code:
             /*tex
@@ -533,6 +538,11 @@ void tex_conditional_if(halfword code, int unless)
                 }
             }
             goto RESULT;
+        case if_zero_dim_code:
+            {
+                result = tex_scan_dimen(0, 0, 0, 0, NULL) == 0;
+            }
+            goto RESULT;
         case if_odd_code:
             /*tex Test if an integer is odd. */
             {