diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index fc8200d955..47bea7ebf0 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -2913,7 +2913,7 @@ pub fn (mut c Checker) fn_call(mut node ast.CallExpr, mut continue_check &bool)
 		if call_arg.typ != param.typ
 			&& (param.typ == ast.voidptr_type || final_param_sym.idx == ast.voidptr_type_idx)
 			&& !call_arg.typ.is_any_kind_of_pointer() && func.language == .v
-			&& !call_arg.expr.is_lvalue() && func.name != 'json.encode' {
+			&& !call_arg.expr.is_lvalue() && func.name != 'json.encode' && !c.pref.translated {
 			c.error('expression cannot be passed as `voidptr`', call_arg.expr.position())
 		}
 		// Handle expected interface
diff --git a/vlib/v/gen/c/cheaders.v b/vlib/v/gen/c/cheaders.v
index cefd8b6511..2bdb1df04e 100644
--- a/vlib/v/gen/c/cheaders.v
+++ b/vlib/v/gen/c/cheaders.v
@@ -542,8 +542,11 @@ typedef struct sync__Channel* chan;
 
 #ifndef __cplusplus
 	#ifndef bool
-		//typedef int bool;
-		typedef byte bool;
+		#ifdef CUSTOM_DEFINE_4bytebool
+			typedef int bool;
+		#else
+			typedef byte bool;
+		#endif
 		#define true 1
 		#define false 0
 	#endif