diff --git a/src/parser/LatexToSympy.ts b/src/parser/LatexToSympy.ts
index 70301b60..657bea56 100644
--- a/src/parser/LatexToSympy.ts
+++ b/src/parser/LatexToSympy.ts
@@ -385,6 +385,9 @@ export class LatexToSympy extends LatexParserVisitor<string | Statement | UnitBl
     } else {
       sympyExpression = this.visitNumber_with_units(ctx.number_with_units());
       guess = this.implicitParams.slice(-1)[0].si_value;
+      if (guess === "_zero_delayed_substitution") {
+        guess = "0";
+      }
     }
 
     const guessStatement: GuessAssignmentStatement = {