diff --git a/src/Utilities/mockoptimizer.jl b/src/Utilities/mockoptimizer.jl
index 00c833b04e..a28525bb02 100644
--- a/src/Utilities/mockoptimizer.jl
+++ b/src/Utilities/mockoptimizer.jl
@@ -821,6 +821,7 @@ function MOI.empty!(mock::MockOptimizer)
     empty!(mock.mock_constraint_attribute)
     mock.optimize_called = false
     mock.termination_status = MOI.OPTIMIZE_NOT_CALLED
+    mock.result_count = 0
     mock.compute_conflict_called = false
     mock.conflict_status = MOI.COMPUTE_CONFLICT_NOT_CALLED
     empty!(mock.constraint_conflict_status)
diff --git a/test/Utilities/test_cachingoptimizer.jl b/test/Utilities/test_cachingoptimizer.jl
index 3b26306a0e..3514c9702e 100644
--- a/test/Utilities/test_cachingoptimizer.jl
+++ b/test/Utilities/test_cachingoptimizer.jl
@@ -757,6 +757,7 @@ function test_status_codes()
         optimizer,
     )
     MOI.Utilities.attach_optimizer(model)
+    MOI.set(optimizer, MOI.ResultCount(), 1)
     MOI.set(optimizer, MOI.TerminationStatus(), MOI.OPTIMAL)
     MOI.set(optimizer, MOI.PrimalStatus(), MOI.FEASIBLE_POINT)
     @test MOI.get(model, MOI.TerminationStatus()) == MOI.OPTIMAL
diff --git a/test/Utilities/test_mockoptimizer.jl b/test/Utilities/test_mockoptimizer.jl
index 1d297f72b6..955267340c 100644
--- a/test/Utilities/test_mockoptimizer.jl
+++ b/test/Utilities/test_mockoptimizer.jl
@@ -308,6 +308,22 @@ function test_empty_constructor()
     return
 end
 
+function test_empty_result_count()
+    optimizer = MOIU.MockOptimizer(MOIU.Model{Float64}())
+    for result_count in (0, 1, 2)
+        MOI.add_variable(optimizer)
+        MOI.set(optimizer, MOI.ResultCount(), result_count)
+        MOI.empty!(optimizer)
+        @test MOI.is_empty(optimizer)
+        @test MOI.get(optimizer, MOI.ResultCount()) == 0
+        @test_throws(
+            MOI.ResultIndexBoundsError(MOI.ObjectiveValue(1), 0),
+            MOI.get(optimizer, MOI.ObjectiveValue(1)),
+        )
+    end
+    return
+end
+
 function test_delete_mock_variable()
     model = MOI.Utilities.MockOptimizer(MOI.Utilities.Model{Float64}())
     x = MOI.add_variables(model, 3)