diff --git a/vlib/v/builder/cc.v b/vlib/v/builder/cc.v
index 396c82ab28..5388c832eb 100644
--- a/vlib/v/builder/cc.v
+++ b/vlib/v/builder/cc.v
@@ -127,6 +127,10 @@ fn (mut v Builder) post_process_c_compiler_output(res os.Result) {
 fn (mut v Builder) rebuild_cached_module(vexe string, imp_path string) string {
 	res := v.pref.cache_manager.exists('.o', imp_path) or {
 		println('Cached $imp_path .o file not found... Building .o file for $imp_path')
+		// do run `v build-module x` always in main vfolder; x can be a relative path
+		pwd := os.getwd()
+		vroot := os.dir(vexe)
+		os.chdir(vroot)
 		boptions := v.pref.build_options.join(' ')
 		rebuild_cmd := '$vexe $boptions build-module $imp_path'
 		// eprintln('>> rebuild_cmd: $rebuild_cmd')
@@ -134,6 +138,7 @@ fn (mut v Builder) rebuild_cached_module(vexe string, imp_path string) string {
 		rebuilded_o := v.pref.cache_manager.exists('.o', imp_path) or {
 			panic('could not rebuild cache module for $imp_path, error: $err')
 		}
+		os.chdir(pwd)
 		return rebuilded_o
 	}
 	return res