diff --git a/src/iis.jl b/src/iis.jl
index ad037b5..90b1245 100644
--- a/src/iis.jl
+++ b/src/iis.jl
@@ -118,12 +118,12 @@ function MOI.get(optimizer::Optimizer, ::MOI.TimeLimitSec)
 end
 
 function MOI.set(optimizer::Optimizer, ::MOI.Silent, value::Bool)
-    optimizer.verbose = value
+    optimizer.verbose = !value
     return
 end
 
 function MOI.get(optimizer::Optimizer, ::MOI.Silent)
-    return optimizer.verbose
+    return !optimizer.verbose
 end
 
 struct SkipFeasibilityCheck <: MOI.AbstractOptimizerAttribute end
diff --git a/test/runtests.jl b/test/runtests.jl
index 2e2050b..df156e1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -430,9 +430,9 @@ function test_pass_attribute()
     MOI.set(solver, MOIIS.InnerOptimizer(), HiGHS.Optimizer)
     MOI.set(solver, MOI.TimeLimitSec(), 5.0)
     @test MOI.get(solver, MOI.TimeLimitSec()) == 5.0
-    @test MOI.get(solver, MOI.Silent()) == false
-    MOI.set(solver, MOI.Silent(), true)
     @test MOI.get(solver, MOI.Silent()) == true
+    MOI.set(solver, MOI.Silent(), false)
+    @test MOI.get(solver, MOI.Silent()) == false
     @test MOI.get(solver, MOIIS.ElasticFilterTolerance()) == 1e-5
     MOI.set(solver, MOIIS.ElasticFilterTolerance(), 1e-3)
     @test MOI.get(solver, MOIIS.ElasticFilterTolerance()) == 1e-3