diff --git a/src/context/mod.rs b/src/context/mod.rs
index 63dc379..041f678 100644
--- a/src/context/mod.rs
+++ b/src/context/mod.rs
@@ -94,8 +94,12 @@ impl Context for EmptyContext {
     }
 
     /// Builtin functions can't be enabled for `EmptyContext`.
-    fn set_builtin_functions_disabled(&mut self, _disabled: bool) -> EvalexprResult<()> {
-        Err(EvalexprError::BuiltinFunctionsCannotBeEnabled)
+    fn set_builtin_functions_disabled(&mut self, disabled: bool) -> EvalexprResult<()> {
+        if disabled {
+            Ok(())
+        } else {
+            Err(EvalexprError::BuiltinFunctionsCannotBeEnabled)
+        }
     }
 }
 
@@ -134,8 +138,12 @@ impl Context for EmptyContextWithBuiltinFunctions {
     }
 
     /// Builtin functions can't be disabled for EmptyContextWithBuiltinFunctions.
-    fn set_builtin_functions_disabled(&mut self, _disabled: bool) -> EvalexprResult<()> {
-        Err(EvalexprError::BuiltinFunctionsCannotBeDisabled)
+    fn set_builtin_functions_disabled(&mut self, disabled: bool) -> EvalexprResult<()> {
+        if disabled {
+            Err(EvalexprError::BuiltinFunctionsCannotBeDisabled)
+        } else {
+            Ok(())
+        }
     }
 }
 
diff --git a/tests/integration.rs b/tests/integration.rs
index 37158ae..c837fa2 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -1527,6 +1527,7 @@ fn test_empty_context() {
             "max"
         )))
     );
+    assert_eq!(context.set_builtin_functions_disabled(true), Ok(()));
     assert_eq!(
         context.set_builtin_functions_disabled(false),
         Err(EvalexprError::BuiltinFunctionsCannotBeEnabled)
@@ -1542,9 +1543,10 @@ fn test_empty_context_with_builtin_functions() {
         Err(EvalexprError::FunctionIdentifierNotFound("abc".to_owned()))
     );
     assert_eq!(eval_with_context("max(1,3)", &context), Ok(Value::Int(3)));
+    assert_eq!(context.set_builtin_functions_disabled(false), Ok(()));
     assert_eq!(
         context.set_builtin_functions_disabled(true),
-        Err(EvalexprError::BuiltinFunctionsCannotBeEnabled)
+        Err(EvalexprError::BuiltinFunctionsCannotBeDisabled)
     );
 }