diff --git a/include/pocketpy/pocketpy.h b/include/pocketpy/pocketpy.h
index 84dbb3c7..c96f05b9 100644
--- a/include/pocketpy/pocketpy.h
+++ b/include/pocketpy/pocketpy.h
@@ -295,8 +295,6 @@ bool py_matchexc(py_Type type);
 /// Clear the current exception.
 void py_clearexc(py_StackRef p0);
 
-#define IOError(...) py_exception(tp_IOError, __VA_ARGS__)
-#define OSError(...) py_exception(tp_OSError, __VA_ARGS__)
 #define NameError(n) py_exception(tp_NameError, "name '%n' is not defined", (n))
 #define TypeError(...) py_exception(tp_TypeError, __VA_ARGS__)
 #define RuntimeError(...) py_exception(tp_RuntimeError, __VA_ARGS__)
diff --git a/src/modules/os.c b/src/modules/os.c
index 984c81f9..f8dff7e0 100644
--- a/src/modules/os.c
+++ b/src/modules/os.c
@@ -31,13 +31,13 @@ static bool os_chdir(int argc, py_Ref argv) {
     PY_CHECK_ARG_TYPE(0, tp_str);
     const char* path = py_tostr(py_arg(0));
     int code = platform_chdir(path);
-    if(code != 0) return OSError("chdir() failed: %d", code);
+    if(code != 0) return py_exception(tp_OSError, "chdir() failed: %d", code);
     return true;
 }
 
 static bool os_getcwd(int argc, py_Ref argv) {
     char buf[1024];
-    if(!platform_getcwd(buf, sizeof(buf))) return OSError("getcwd() failed");
+    if(!platform_getcwd(buf, sizeof(buf))) return py_exception(tp_OSError, "getcwd() failed");
     py_newstr(py_retval(), buf);
     return true;
 }