diff --git a/src/Test/UnitTests/attributes.jl b/src/Test/UnitTests/attributes.jl
index 9c99698018..d6532cb407 100644
--- a/src/Test/UnitTests/attributes.jl
+++ b/src/Test/UnitTests/attributes.jl
@@ -157,17 +157,18 @@ for attr in (
             MOI.optimize!(model)
             attribute = MOI.$(attr)()
             T = MOI.attribute_value_type(attribute)
-            # Use this syntax if T is a small union like Union{Nothing,Int}.
-            @test @inferred(T, MOI.get(model, attribute)) isa T
+            if VERSION < 1.5
+                @test MOI.get(model, attribute) isa T
+            else
+                @test @inferred(T, MOI.get(model, attribute)) isa T
+            end
         end
         # unittests["test_attribute_$(attr)"]
     end
 end
 
 # Variable attributes.
-for attr in (
-    :VariableName,
-)
+for attr in (:VariableName,)
     f = Symbol("test_attribute_$(attr)")
     @eval begin
         function $(f)(model::MOI.ModelLike, config::TestConfig)
@@ -177,7 +178,11 @@ for attr in (
             MOI.optimize!(model)
             attribute = MOI.$(attr)()
             T = MOI.attribute_value_type(attribute)
-            @test @inferred(T, MOI.get(model, attribute, x)) isa T
+            if VERSION < 1.5
+                @test MOI.get(model, attribute, x) isa T
+            else
+                @test @inferred(T, MOI.get(model, attribute, x)) isa T
+            end
         end
         # unittests["test_attribute_$(attr)"]
     end
@@ -204,7 +209,11 @@ for attr in (
             MOI.set(model, MOI.ConstraintName(), ci, "ci")
             attribute = MOI.$(attr)()
             T = MOI.attribute_value_type(attribute)
-            @test @inferred(T, MOI.get(model, attribute, ci)) isa T
+            if VERSION < 1.5
+                @test MOI.get(model, attribute, ci) isa T
+            else
+                @test @inferred(T, MOI.get(model, attribute, ci)) isa T
+            end
         end
         # unittests["test_attribute_$(attr)"]
     end
diff --git a/src/Utilities/cachingoptimizer.jl b/src/Utilities/cachingoptimizer.jl
index e5dfd41fd5..45a0e0b51f 100644
--- a/src/Utilities/cachingoptimizer.jl
+++ b/src/Utilities/cachingoptimizer.jl
@@ -688,10 +688,7 @@ function MOI.supports(
            (m.state == NO_OPTIMIZER || MOI.supports(m.optimizer, attr))
 end
 
-function MOI.get(
-    model::CachingOptimizer,
-    attr::MOI.AbstractModelAttribute,
-)
+function MOI.get(model::CachingOptimizer, attr::MOI.AbstractModelAttribute)
     if MOI.is_set_by_optimize(attr)
         if state(model) == NO_OPTIMIZER
             if attr == MOI.TerminationStatus()
@@ -883,7 +880,7 @@ function MOI.get(
         MOI.get(
             m.optimizer,
             attr.attr,
-            m.model_to_optimizer_map[idx]
+            m.model_to_optimizer_map[idx],
         )::MOI.attribute_value_type(attr.attr),
     )
 end
diff --git a/src/attributes.jl b/src/attributes.jl
index c3438b674f..10c94a3216 100644
--- a/src/attributes.jl
+++ b/src/attributes.jl
@@ -1376,7 +1376,9 @@ A constraint attribute indicating whether the constraint participates
 in the conflict. Its type is [`ConflictParticipationStatusCode`](@ref).
 """
 struct ConstraintConflictStatus <: AbstractConstraintAttribute end
-attribute_value_type(::ConstraintConflictStatus) = ConflictParticipationStatusCode
+function attribute_value_type(::ConstraintConflictStatus)
+    return ConflictParticipationStatusCode
+end
 
 ## Termination status
 
@@ -1606,8 +1608,7 @@ end
 
 # Cost of bridging F-in-S constraints
 struct ConstraintBridgingCost{F<:AbstractFunction,S<:AbstractSet} <:
-       AbstractModelAttribute
-end
+       AbstractModelAttribute end
 
 attribute_value_type(::ConstraintBridgingCost) = Float64
 
diff --git a/test/Utilities/mockoptimizer.jl b/test/Utilities/mockoptimizer.jl
index a0b36d9f3e..d7e0994d67 100644
--- a/test/Utilities/mockoptimizer.jl
+++ b/test/Utilities/mockoptimizer.jl
@@ -234,7 +234,7 @@ end
 
 @testset "test_model_optimizer_attributes" begin
     model = MOI.Utilities.MockOptimizer(
-        MOI.Utilities.UniversalFallback(MOI.Utilities.Model{Float64}())
+        MOI.Utilities.UniversalFallback(MOI.Utilities.Model{Float64}()),
     )
     config = MOI.Test.TestConfig()
     MOI.set(model, MOI.NumberOfThreads(), 4)
@@ -282,7 +282,7 @@ end
 
 @testset "test_variable_attributes" begin
     model = MOI.Utilities.MockOptimizer(
-        MOI.Utilities.UniversalFallback(MOI.Utilities.Model{Float64}())
+        MOI.Utilities.UniversalFallback(MOI.Utilities.Model{Float64}()),
     )
     config = MOI.Test.TestConfig()
     MOI.Test.test_attribute_VariableName(model, config)
@@ -290,7 +290,7 @@ end
 
 @testset "test_constraint_attributes" begin
     model = MOI.Utilities.MockOptimizer(
-        MOI.Utilities.UniversalFallback(MOI.Utilities.Model{Float64}())
+        MOI.Utilities.UniversalFallback(MOI.Utilities.Model{Float64}()),
     )
     config = MOI.Test.TestConfig()
     MOI.Test.test_attribute_ConstraintFunction(model, config)