diff --git a/src/parse_nlp.jl b/src/parse_nlp.jl
index 9578aee28c6..bbd3434ab9e 100644
--- a/src/parse_nlp.jl
+++ b/src/parse_nlp.jl
@@ -167,7 +167,7 @@ function _parse_NL_expr(m, x, tapevar, parent, values)
 
 end
 
-function _parse_NL_expr_runtime(m::Model, x::Number, tape, parent, values)
+function _parse_NL_expr_runtime(m::Model, x::Real, tape, parent, values)
     push!(values, x)
     push!(tape, NodeData(VALUE, length(values), parent))
     nothing
diff --git a/test/nlp.jl b/test/nlp.jl
index 7d8d1e5fe95..92751f52846 100644
--- a/test/nlp.jl
+++ b/test/nlp.jl
@@ -619,7 +619,7 @@
         evaluator = JuMP.NLPEvaluator(model)
         @test !(:Hess in MOI.features_available(evaluator))
     end
-    
+
     @testset "Error on using AffExpr in NLexpression" begin
         model = Model()
         @variable(model, x)
@@ -632,7 +632,7 @@
         )
         @test_throws expected_exception @NLexpression(model, A)
     end
-    
+
     @testset "Error on using QuadExpr in NLexpression" begin
         model = Model()
         @variable(model, x)
@@ -645,4 +645,13 @@
         )
         @test_throws expected_exception @NLexpression(model, A)
     end
+    @testset "Error on complex values" begin
+        model = Model()
+        @variable(model, x)
+        c = sqrt(Complex(-1))
+        expected_exception = ErrorException(
+            "Unexpected object $c (of type $(typeof(c)) in nonlinear expression."
+        )
+        @test_throws expected_exception @NLobjective(model, Min, c * x)
+    end
 end