diff --git a/include/pocketpy/common/str.h b/include/pocketpy/common/str.h
index 5ccaf5f7..fb6a52db 100644
--- a/include/pocketpy/common/str.h
+++ b/include/pocketpy/common/str.h
@@ -56,6 +56,7 @@ c11_sv c11_sv__slice2(c11_sv sv, int start, int stop);
 c11_sv c11_sv__strip(c11_sv sv, c11_sv chars, bool left, bool right);
 int c11_sv__index(c11_sv self, char c);
 int c11_sv__rindex(c11_sv self, char c);
+c11_sv c11_sv__filename(c11_sv self);
 int c11_sv__index2(c11_sv self, c11_sv sub, int start);
 int c11_sv__count(c11_sv self, c11_sv sub);
 bool c11_sv__startswith(c11_sv self, c11_sv prefix);
diff --git a/src/common/str.c b/src/common/str.c
index bdd852a5..5a336664 100644
--- a/src/common/str.c
+++ b/src/common/str.c
@@ -147,6 +147,14 @@ int c11_sv__rindex(c11_sv self, char c) {
     return -1;
 }
 
+c11_sv c11_sv__filename(c11_sv self) {
+    int sep_index_1 = c11_sv__rindex(self, '/');
+    int sep_index_2 = c11_sv__rindex(self, '\\');
+    int sep_index = c11__max(sep_index_1, sep_index_2);
+    if(sep_index == -1) return self;
+    return c11_sv__slice(self, sep_index + 1);
+}
+
 int c11_sv__index2(c11_sv self, c11_sv sub, int start) {
     if(sub.size == 0) return start;
     int max_end = self.size - sub.size;
diff --git a/src/public/ModuleSystem.c b/src/public/ModuleSystem.c
index c641e68c..4c362b59 100644
--- a/src/public/ModuleSystem.c
+++ b/src/public/ModuleSystem.c
@@ -78,8 +78,10 @@ int py_import(const char* path_cstr) {
         while(dot_count < path.size && path.data[dot_count] == '.')
             dot_count++;
 
-        c11_sv top_filename = c11_string__sv(vm->top_frame->co->src->filename);
-        int is_init = c11_sv__endswith(top_filename, (c11_sv){"__init__.py", 11});
+        // */__init__.py[c]
+        c11_sv top_filepath = c11_string__sv(vm->top_frame->co->src->filename);
+        c11_sv top_filename = c11_sv__filename(top_filepath);
+        int is_init = c11__sveq2(top_filename, "__init__.py") || c11__sveq2(top_filename, "__init__.pyc");
 
         py_ModuleInfo* mi = py_touserdata(vm->top_frame->module);
         c11_sv package_sv = c11_string__sv(mi->path);