diff --git a/pkg/apis/pipeline/v1/task_validation.go b/pkg/apis/pipeline/v1/task_validation.go
index 4232d295d2b..0ac347e18be 100644
--- a/pkg/apis/pipeline/v1/task_validation.go
+++ b/pkg/apis/pipeline/v1/task_validation.go
@@ -643,12 +643,13 @@ func validateTaskContextVariables(ctx context.Context, steps []Step) *apis.Field
 
 // validateTaskResultsVariables validates if the results referenced in step script are defined in task results
 func validateTaskResultsVariables(ctx context.Context, steps []Step, results []TaskResult) (errs *apis.FieldError) {
-	resultsNames := sets.NewString()
+	taskResultNames := sets.NewString()
 	for _, r := range results {
-		resultsNames.Insert(r.Name)
+		taskResultNames.Insert(r.Name)
 	}
+
 	for idx, step := range steps {
-		errs = errs.Also(substitution.ValidateNoReferencesToUnknownVariables(step.Script, "results", resultsNames).ViaField("script").ViaFieldIndex("steps", idx))
+		errs = errs.Also(substitution.ValidateNoReferencesToUnknownVariables(step.Script, "results", taskResultNames).ViaField("script").ViaFieldIndex("steps", idx))
 	}
 	return errs
 }
@@ -859,6 +860,5 @@ func ValidateStepResultsVariables(ctx context.Context, results []StepResult, scr
 		resultsNames.Insert(r.Name)
 	}
 	errs = errs.Also(substitution.ValidateNoReferencesToUnknownVariables(script, "step.results", resultsNames).ViaField("script"))
-	errs = errs.Also(substitution.ValidateNoReferencesToUnknownVariables(script, "results", resultsNames).ViaField("script"))
 	return errs
 }
diff --git a/pkg/substitution/substitution.go b/pkg/substitution/substitution.go
index 8e1acab2fe1..38bfa305448 100644
--- a/pkg/substitution/substitution.go
+++ b/pkg/substitution/substitution.go
@@ -65,7 +65,7 @@ func ValidateNoReferencesToUnknownVariables(value, prefix string, vars sets.Stri
 			v = TrimArrayIndex(v)
 			if !vars.Has(v) {
 				return &apis.FieldError{
-					Message: fmt.Sprintf("non-existent variable in %q", value),
+					Message: fmt.Sprintf("non-existent variable %s in %q", v, value),
 					// Empty path is required to make the `ViaField`, … work
 					Paths: []string{""},
 				}