diff --git a/tests/unit_tests/build_gen/test_arduino8266.py b/tests/unit_tests/build_gen/test_arduino8266.py
index 2b66b36138..59866af6b7 100644
--- a/tests/unit_tests/build_gen/test_arduino8266.py
+++ b/tests/unit_tests/build_gen/test_arduino8266.py
@@ -258,17 +258,20 @@ def test_write_project_link_line_and_exclusions(tmp_path: Path) -> None:
     assert '"$in"' not in content
     assert '"$out"' not in content
     # -L/-l from esphome build_flags reach the link line, not the compiles;
-    # spaced forms ("-L /path") are shell-lexed the way PlatformIO does
-    assert '-L"/opt/blobs"' in content
+    # spaced forms ("-L /path") are shell-lexed the way PlatformIO does.
+    # str(Path(...)) so the separator matches the host platform.
+    opt_blobs = str(Path("/opt/blobs"))
+    spc_blobs = str(Path("/spc/blobs"))
+    assert f'-L"{opt_blobs}"' in content
     assert "-luser_blob" in content
-    assert '-L"/spc/blobs"' in content
+    assert f'-L"{spc_blobs}"' in content
     assert "-lspaced_blob" in content
     for line in content.splitlines():
         if line.split(" = ")[0] in ("cflags", "cxxflags", "asflags"):
             assert "user_blob" not in line
-            assert "/opt/blobs" not in line
+            assert opt_blobs not in line
             assert "spaced_blob" not in line
-            assert "/spc/blobs" not in line
+            assert spc_blobs not in line
     # System libraries with the selected lwIP variant, in the builder's order
     assert (
         "-lhal -lphy -lpp -lnet80211 -llwip2-1460 -lwpa -lcrypto -lmain -lwps "
diff --git a/tests/unit_tests/test_arduino8266_toolchain.py b/tests/unit_tests/test_arduino8266_toolchain.py
index 1a713e6a57..9cf59c56e1 100644
--- a/tests/unit_tests/test_arduino8266_toolchain.py
+++ b/tests/unit_tests/test_arduino8266_toolchain.py
@@ -50,9 +50,11 @@ def _paths(tmp_path: Path) -> dict[str, Path]:
 def test_path_getters(tmp_path: Path) -> None:
     assert toolchain.get_build_dir() == CORE.relative_pioenvs_path("test8266")
     assert toolchain.get_elf_path().name == "firmware.elf"
-    assert toolchain.get_addr2line_path().name == "xtensa-lx106-elf-addr2line"
-    assert toolchain.get_objdump_path().name == "xtensa-lx106-elf-objdump"
-    assert toolchain.get_readelf_path().name == "xtensa-lx106-elf-readelf"
+    # Pin both suffix variants so the test passes on every host platform
+    with patch.object(toolchain, "_EXE_SUFFIX", ""):
+        assert toolchain.get_addr2line_path().name == "xtensa-lx106-elf-addr2line"
+        assert toolchain.get_objdump_path().name == "xtensa-lx106-elf-objdump"
+        assert toolchain.get_readelf_path().name == "xtensa-lx106-elf-readelf"
     # Windows binutils carry the executable suffix
     with patch.object(toolchain, "_EXE_SUFFIX", ".exe"):
         assert toolchain.get_addr2line_path().name == "xtensa-lx106-elf-addr2line.exe"