diff --git a/programs/msiexec/msiexec.c b/programs/msiexec/msiexec.c
index 71e81c89add..bdb1b90817a 100644
--- a/programs/msiexec/msiexec.c
+++ b/programs/msiexec/msiexec.c
@@ -487,6 +487,7 @@ static BOOL process_args_from_reg( LPWSTR ident, int *pargc, WCHAR ***pargv )
 			process_args(buf, pargc, pargv);
 			ret = TRUE;
 		}
+		HeapFree(GetProcessHeap(), 0, buf);
 	}
 	RegCloseKey(hkeyArgs);
 	return ret;