diff --git a/libc-test/semver/emscripten.txt b/libc-test/semver/emscripten.txt
index 35f7d85de518..b155786c4241 100644
--- a/libc-test/semver/emscripten.txt
+++ b/libc-test/semver/emscripten.txt
@@ -7,4 +7,3 @@ getgrnam_r
 getpwnam_r
 getpwuid_r
 in6_pktinfo
-posix_fallocate64
diff --git a/src/unix/linux_like/emscripten/mod.rs b/src/unix/linux_like/emscripten/mod.rs
index f3fd341ef304..db9eed1ce7a0 100644
--- a/src/unix/linux_like/emscripten/mod.rs
+++ b/src/unix/linux_like/emscripten/mod.rs
@@ -28,19 +28,38 @@ pub type fsfilcnt_t = u32;
 pub type rlim_t = u64;
 pub type nlink_t = u32;
 
-pub type ino64_t = crate::ino_t;
+#[deprecated(since = "0.2.187", note = "Use `ino_t` instead. See #5142.")]
+pub type ino64_t = ino_t;
+
+#[deprecated(since = "0.2.187", note = "Use `off_t` instead. See #5142.")]
 pub type off64_t = off_t;
+
+#[deprecated(since = "0.2.187", note = "Use `blkcnt_t` instead. See #5142.")]
 pub type blkcnt64_t = crate::blkcnt_t;
+
+#[deprecated(since = "0.2.187", note = "Use `rlim_t` instead. See #5142.")]
 pub type rlim64_t = crate::rlim_t;
 
+#[deprecated(since = "0.2.187", note = "Use `rlimit` instead. See #5142.")]
 pub type rlimit64 = crate::rlimit;
+
+#[deprecated(since = "0.2.187", note = "Use `flock` instead. See #5142.")]
 pub type flock64 = crate::flock;
+
+#[deprecated(since = "0.2.187", note = "Use `stat` instead. See #5142.")]
 pub type stat64 = crate::stat;
+
+#[deprecated(since = "0.2.187", note = "Use `statfs` instead. See #5142.")]
 pub type statfs64 = crate::statfs;
+
+#[deprecated(since = "0.2.187", note = "Use `statvfs` instead. See #5142.")]
 pub type statvfs64 = crate::statvfs;
+
+#[deprecated(since = "0.2.187", note = "Use `dirent` instead. See #5142.")]
 pub type dirent64 = crate::dirent;
 
 extern_ty! {
+    #[deprecated(since = "0.2.187", note = "Use `fpos_t` instead. See #5142.")]
     pub type fpos64_t; // FIXME(emscripten): fill this out with a struct
 }
 
@@ -1461,5 +1480,16 @@ extern "C" {
 }
 
 // Alias <foo> to <foo>64 to mimic glibc's LFS64 support
+#[deprecated(
+    since = "0.2.187",
+    note = "Use \"64\"-unsuffixed routines instead. See #5142."
+)]
+#[allow(deprecated)]
 mod lfs64;
+
+#[deprecated(
+    since = "0.2.187",
+    note = "Use \"64\"-unsuffixed routines instead. See #5142."
+)]
+#[allow(deprecated)]
 pub use self::lfs64::*;
diff --git a/src/unix/linux_like/mod.rs b/src/unix/linux_like/mod.rs
index f37daf13f1f7..938e5c2520f5 100644
--- a/src/unix/linux_like/mod.rs
+++ b/src/unix/linux_like/mod.rs
@@ -544,6 +544,7 @@ cfg_if! {
     if #[cfg(target_os = "android")] {
         pub const RLIM64_INFINITY: c_ulonglong = !0;
     } else {
+        #[cfg_attr(target_os = "emscripten", allow(deprecated))]
         pub const RLIM64_INFINITY: crate::rlim64_t = !0;
     }
 }