diff --git a/feature_tests/kotlin/somelib/src/main/kotlin/dev/diplomattest/somelib/OptionOpaque.kt b/feature_tests/kotlin/somelib/src/main/kotlin/dev/diplomattest/somelib/OptionOpaque.kt
index 04e94f5d9..5e881049e 100644
--- a/feature_tests/kotlin/somelib/src/main/kotlin/dev/diplomattest/somelib/OptionOpaque.kt
+++ b/feature_tests/kotlin/somelib/src/main/kotlin/dev/diplomattest/somelib/OptionOpaque.kt
@@ -88,7 +88,7 @@ class OptionOpaque internal constructor (
         fun optionOpaqueArgument(arg: OptionOpaque?): Boolean {
             
             val returnVal = lib.OptionOpaque_option_opaque_argument(arg?.handle);
-            return returnVal > 0
+            return (returnVal > 0)
         }
     }
     
diff --git a/tool/src/kotlin/mod.rs b/tool/src/kotlin/mod.rs
index 13dd12a1c..5080a17fb 100644
--- a/tool/src/kotlin/mod.rs
+++ b/tool/src/kotlin/mod.rs
@@ -695,7 +695,12 @@ return string{return_type_modifier}"#
         match o {
             Type::Primitive(prim) => {
                 let maybe_unsized_modifier = self.formatter.fmt_unsized_conversion(*prim, false);
-                format!("return {val_name}{return_type_modifier}{maybe_unsized_modifier}")
+                match prim {
+                    PrimitiveType::Bool => {
+                        format!("return ({val_name}{maybe_unsized_modifier}){return_type_modifier}")
+                    }
+                    _ => format!("return {val_name}{return_type_modifier}{maybe_unsized_modifier}"),
+                }
             }
             Type::Opaque(opaque_path) => self.gen_opaque_return_conversion(
                 opaque_path,
@@ -2022,6 +2027,10 @@ mod test {
                     pub fn get_u_byte_slice<'a>() -> &'a [u8] {
                         todo!()
                     }
+
+                    pub fn boolean_result() -> Result<bool, ()> {
+                        todo!()
+                    }
                 }
             }
         };
diff --git a/tool/src/kotlin/snapshots/diplomat_tool__kotlin__test__struct.snap b/tool/src/kotlin/snapshots/diplomat_tool__kotlin__test__struct.snap
index b102bf6ff..3fcaabda5 100644
--- a/tool/src/kotlin/snapshots/diplomat_tool__kotlin__test__struct.snap
+++ b/tool/src/kotlin/snapshots/diplomat_tool__kotlin__test__struct.snap
@@ -1,6 +1,6 @@
 ---
 source: tool/src/kotlin/mod.rs
-assertion_line: 1828
+assertion_line: 2057
 expression: struct_code
 ---
 package dev.gigapixel.somelib
@@ -15,6 +15,7 @@ internal interface MyNativeStructLib: Library {
     fun MyNativeStruct_new(): MyNativeStructNative
     fun MyNativeStruct_test_multi_arg_callback(f: DiplomatCallback_MyNativeStruct_test_multi_arg_callback_diplomatCallback_f_Native, x: Int): Int
     fun MyNativeStruct_get_u_byte_slice(): Slice
+    fun MyNativeStruct_boolean_result(): ResultByteUnit
 }
 
 internal class MyNativeStructNative: Structure(), Structure.ByValue {
@@ -147,6 +148,16 @@ class MyNativeStruct internal constructor (
             val returnVal = lib.MyNativeStruct_get_u_byte_slice();
                 return PrimitiveArrayTools.getUByteArray(returnVal)
         }
+        
+        fun booleanResult(): Res<Boolean, Unit> {
+            
+            val returnVal = lib.MyNativeStruct_boolean_result();
+            if (returnVal.isOk == 1.toByte()) {
+                return (returnVal.union.ok > 0).ok()
+            } else {
+                return Err(Unit)
+            }
+        }
     }
 
 }