diff --git a/libc/dlopen/dlfcn.h b/libc/dlopen/dlfcn.h
index c50dcc891..2514d908d 100644
--- a/libc/dlopen/dlfcn.h
+++ b/libc/dlopen/dlfcn.h
@@ -20,6 +20,7 @@ int dlclose(void *);
 char *cosmo_dlerror(void);
 void *cosmo_dlopen(const char *, int);
 void *cosmo_dlsym(void *, const char *);
+void *cosmo_dltramp(void *);
 int cosmo_dlclose(void *);
 #endif
 
diff --git a/libc/dlopen/dlopen.c b/libc/dlopen/dlopen.c
index 7d36feac5..1a0bdf143 100644
--- a/libc/dlopen/dlopen.c
+++ b/libc/dlopen/dlopen.c
@@ -843,6 +843,17 @@ void *cosmo_dlsym(void *handle, const char *name) {
   return func;
 }
 
+/**
+ * Trampolines foreign function pointer so it can be called safely.
+ */
+void *cosmo_dltramp(void *foreign_func) {
+  if (!IsWindows()) {
+    return foreign_thunk_sysv(foreign_func);
+  } else {
+    return foreign_thunk_nt(foreign_func);
+  }
+}
+
 /**
  * Closes dynamic shared object.
  *