diff --git a/src/shims/unix/fs.rs b/src/shims/unix/fs.rs
index b41a4d2246..387459be20 100644
--- a/src/shims/unix/fs.rs
+++ b/src/shims/unix/fs.rs
@@ -1048,10 +1048,12 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         }
     }
 
-    fn linux_readdir64(&mut self, dirp_op: &OpTy<'tcx>) -> InterpResult<'tcx, Scalar> {
+    fn linux_solarish_readdir64(&mut self, dirp_op: &OpTy<'tcx>) -> InterpResult<'tcx, Scalar> {
         let this = self.eval_context_mut();
 
-        this.assert_target_os("linux", "readdir64");
+        if !matches!(&*this.tcx.sess.target.os, "linux" | "solaris" | "illumos") {
+            panic!("`linux_solaris_readdir64` should not be called on {}", this.tcx.sess.target.os);
+        }
 
         let dirp = this.read_target_usize(dirp_op)?;
 
@@ -1086,8 +1088,18 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let name_bytes = name.as_encoded_bytes();
                 let name_len = u64::try_from(name_bytes.len()).unwrap();
 
-                let dirent64_layout = this.libc_ty_layout("dirent64");
-                let d_name_offset = dirent64_layout.fields.offset(4 /* d_name */).bytes();
+                let is_linux = matches!(&*this.tcx.sess.target.os, "linux");
+
+                let dirent64_layout = if is_linux {
+                    this.libc_ty_layout("dirent64")
+                } else {
+                    this.libc_ty_layout("dirent")
+                };
+                let d_name_offset = if is_linux {
+                    dirent64_layout.fields.offset(4 /* d_name */).bytes()
+                } else {
+                    dirent64_layout.fields.offset(3 /* d_name */).bytes()
+                };
                 let size = d_name_offset.strict_add(name_len);
 
                 let entry = this.allocate_ptr(
@@ -1105,17 +1117,18 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let ino = 0u64;
 
                 let file_type = this.file_type_to_d_type(dir_entry.file_type())?;
-
                 this.write_int_fields_named(
-                    &[
-                        ("d_ino", ino.into()),
-                        ("d_off", 0),
-                        ("d_reclen", size.into()),
-                        ("d_type", file_type.into()),
-                    ],
+                    &[("d_ino", ino.into()), ("d_off", 0), ("d_reclen", size.into())],
                     &this.ptr_to_mplace(entry, dirent64_layout),
                 )?;
 
+                if is_linux {
+                    this.write_int_fields_named(
+                        &[("d_type", file_type.into())],
+                        &this.ptr_to_mplace(entry, dirent64_layout),
+                    )?;
+                }
+
                 let name_ptr = entry.wrapping_offset(Size::from_bytes(d_name_offset), this);
                 this.write_bytes_ptr(name_ptr, name_bytes.iter().copied())?;
 
diff --git a/src/shims/unix/linux/foreign_items.rs b/src/shims/unix/linux/foreign_items.rs
index bc3619090c..6697fa49e4 100644
--- a/src/shims/unix/linux/foreign_items.rs
+++ b/src/shims/unix/linux/foreign_items.rs
@@ -37,7 +37,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             "readdir64" => {
                 let [dirp] =
                     this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;
-                let result = this.linux_readdir64(dirp)?;
+                let result = this.linux_solarish_readdir64(dirp)?;
                 this.write_scalar(result, dest)?;
             }
             "sync_file_range" => {
diff --git a/src/shims/unix/solarish/foreign_items.rs b/src/shims/unix/solarish/foreign_items.rs
index e452917036..418bb7c016 100644
--- a/src/shims/unix/solarish/foreign_items.rs
+++ b/src/shims/unix/solarish/foreign_items.rs
@@ -76,6 +76,12 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 let result = this.macos_fbsd_solaris_fstat(fd, buf)?;
                 this.write_scalar(result, dest)?;
             }
+            "readdir" | "readdir64" => {
+                let [dirp] =
+                    this.check_shim(abi, ExternAbi::C { unwind: false }, link_name, args)?;
+                let result = this.linux_solarish_readdir64(dirp)?;
+                this.write_scalar(result, dest)?;
+            }
 
             // Miscellaneous
             "___errno" => {
diff --git a/tests/pass/shims/fs.rs b/tests/pass/shims/fs.rs
index 3e514d95ee..c3653d6657 100644
--- a/tests/pass/shims/fs.rs
+++ b/tests/pass/shims/fs.rs
@@ -27,11 +27,8 @@ fn main() {
     test_file_sync();
     test_errors();
     test_rename();
-    // solarish needs to support readdir/readdir64 for these tests.
-    if cfg!(not(any(target_os = "solaris", target_os = "illumos"))) {
-        test_directory();
-        test_canonicalize();
-    }
+    test_directory();
+    test_canonicalize();
     test_from_raw_os_error();
     #[cfg(unix)]
     test_pread_pwrite();
@@ -279,7 +276,15 @@ fn test_directory() {
             .collect::<BTreeMap<_, _>>()
     );
     // Deleting the directory should fail, since it is not empty.
-    assert_eq!(ErrorKind::DirectoryNotEmpty, remove_dir(&dir_path).unwrap_err().kind());
+    let errno = if cfg!(any(target_os = "solaris", target_os = "illumos")) {
+        // Solaris/Illumos `rmdir` call set errno to EEXIST if directory contains
+        // other entries than `.` and `..`.
+        // https://docs.oracle.com/cd/E86824_01/html/E54765/rmdir-2.html
+        ErrorKind::AlreadyExists
+    } else {
+        ErrorKind::DirectoryNotEmpty
+    };
+    assert_eq!(errno, remove_dir(&dir_path).unwrap_err().kind());
     // Clean up the files in the directory
     remove_file(&path_1).unwrap();
     remove_file(&path_2).unwrap();